function build() {
		var svg = { };
		
		svg.FRAMERATE = 30;
		svg.MAX_VIRTUAL_PIXELS = 30000;
		
		// globals
		svg.init = function(ctx) {
			var uniqueId = 0;
			svg.UniqueId = function () { uniqueId++; return 'canvg' + uniqueId;	};
			svg.Definitions = {};
			svg.Styles = {};
			svg.Animations = [];
			svg.Images = [];
			svg.ctx = ctx;
			svg.ViewPort = new (function () {
				this.viewPorts = [];
				this.Clear = function() { this.viewPorts = []; }
				this.SetCurrent = function(width, height) { this.viewPorts.push({ width: width, height: height }); }
				this.RemoveCurrent = function() { this.viewPorts.pop(); }
				this.Current = function() { return this.viewPorts[this.viewPorts.length - 1]; }
				this.width = function() { return this.Current().width; }
				this.height = function() { return this.Current().height; }
				this.ComputeSize = function(d) {
					if (d != null && typeof(d) == 'number') return d;
					if (d == 'x') return this.width();
					if (d == 'y') return this.height();
					return Math.sqrt(Math.pow(this.width(), 2) + Math.pow(this.height(), 2)) / Math.sqrt(2);			
				}
			});
		}
		svg.init();
		
		// images loaded
		svg.ImagesLoaded = function() { 
			for (var i=0; i<svg.Images.length; i++) {
				if (!svg.Images[i].loaded) return false;
			}
			return true;
		}

		// trim
		svg.trim = function(s) { return s.replace(/^\s+|\s+$/g, ''); }
		
		// compress spaces
		svg.compressSpaces = function(s) { return s.replace(/[\s\r\t\n]+/gm,' '); }
		
		// ajax
		svg.ajax = function(url) {
			var AJAX;
			if(window.XMLHttpRequest){AJAX=new XMLHttpRequest();}
			else{AJAX=new ActiveXObject('Microsoft.XMLHTTP');}
			if(AJAX){
			   AJAX.open('GET',url,false);
			   AJAX.send(null);
			   return AJAX.responseText;
			}
			return null;
		} 
		
		// parse xml
		svg.parseXml = function(xml) {
			if (window.DOMParser)
			{
				var parser = new DOMParser();
				return parser.parseFromString(xml, 'text/xml');
			}
			else 
			{
				xml = xml.replace(/<!DOCTYPE svg[^>]*>/, '');
				var xmlDoc = new ActiveXObject('Microsoft.XMLDOM');
				xmlDoc.async = 'false';
				xmlDoc.loadXML(xml); 
				return xmlDoc;
			}		
		}
		
		svg.Property = function(name, value) {
			this.name = name;
			this.value = value;
		}	
			svg.Property.prototype.getValue = function() {
				return this.value;
			}
		
			svg.Property.prototype.hasValue = function() {
				return (this.value != null && this.value !== '');
			}
							
			// return the numerical value of the property
			svg.Property.prototype.numValue = function() {
				if (!this.hasValue()) return 0;
				
				var n = parseFloat(this.value);
				if ((this.value + '').match(/%$/)) {
					n = n / 100.0;
				}
				return n;
			}
			
			svg.Property.prototype.valueOrDefault = function(def) {
				if (this.hasValue()) return this.value;
				return def;
			}
			
			svg.Property.prototype.numValueOrDefault = function(def) {
				if (this.hasValue()) return this.numValue();
				return def;
			}
			
			// color extensions
				// augment the current color value with the opacity
				svg.Property.prototype.addOpacity = function(opacity) {
					var newValue = this.value;
					if (opacity != null && opacity != '' && typeof(this.value)=='string') { // can only add opacity to colors, not patterns
						var color = new RGBColor(this.value);
						if (color.ok) {
							newValue = 'rgba(' + color.r + ', ' + color.g + ', ' + color.b + ', ' + opacity + ')';
						}
					}
					return new svg.Property(this.name, newValue);
				}
			
			// definition extensions
				// get the definition from the definitions table
				svg.Property.prototype.getDefinition = function() {
					var name = this.value.match(/#([^\)'"]+)/);
					if (name) { name = name[1]; }
					if (!name) { name = this.value; }
					return svg.Definitions[name];
				}
				
				svg.Property.prototype.isUrlDefinition = function() {
					return this.value.indexOf('url(') == 0
				}
				
				svg.Property.prototype.getFillStyleDefinition = function(e, opacityProp) {
					var def = this.getDefinition();
					
					// gradient
					if (def != null && def.createGradient) {
						return def.createGradient(svg.ctx, e, opacityProp);
					}
					
					// pattern
					if (def != null && def.createPattern) {
						if (def.getHrefAttribute().hasValue()) {
							var pt = def.attribute('patternTransform');
							def = def.getHrefAttribute().getDefinition();
							if (pt.hasValue()) { def.attribute('patternTransform', true).value = pt.value; }
						}
						return def.createPattern(svg.ctx, e);
					}
					
					return null;
				}
			
			// length extensions
				svg.Property.prototype.getDPI = function(viewPort) {
					return 96.0; // TODO: compute?
				}
				
				svg.Property.prototype.getEM = function(viewPort) {
					var em = 12;
					
					var fontSize = new svg.Property('fontSize', svg.Font.Parse(svg.ctx.font).fontSize);
					if (fontSize.hasValue()) em = fontSize.toPixels(viewPort);
					
					return em;
				}
				
				svg.Property.prototype.getUnits = function() {
					var s = this.value+'';
					return s.replace(/[0-9\.\-]/g,'');
				}
			
				// get the length as pixels
				svg.Property.prototype.toPixels = function(viewPort, processPercent) {
					if (!this.hasValue()) return 0;
					var s = this.value+'';
					if (s.match(/em$/)) return this.numValue() * this.getEM(viewPort);
					if (s.match(/ex$/)) return this.numValue() * this.getEM(viewPort) / 2.0;
					if (s.match(/px$/)) return this.numValue();
					if (s.match(/pt$/)) return this.numValue() * this.getDPI(viewPort) * (1.0 / 72.0);
					if (s.match(/pc$/)) return this.numValue() * 15;
					if (s.match(/cm$/)) return this.numValue() * this.getDPI(viewPort) / 2.54;
					if (s.match(/mm$/)) return this.numValue() * this.getDPI(viewPort) / 25.4;
					if (s.match(/in$/)) return this.numValue() * this.getDPI(viewPort);
					if (s.match(/%$/)) return this.numValue() * svg.ViewPort.ComputeSize(viewPort);
					var n = this.numValue();
					if (processPercent && n < 1.0) return n * svg.ViewPort.ComputeSize(viewPort);
					return n;
				}

			// time extensions
				// get the time as milliseconds
				svg.Property.prototype.toMilliseconds = function() {
					if (!this.hasValue()) return 0;
					var s = this.value+'';
					if (s.match(/s$/)) return this.numValue() * 1000;
					if (s.match(/ms$/)) return this.numValue();
					return this.numValue();
				}
			
			// angle extensions
				// get the angle as radians
				svg.Property.prototype.toRadians = function() {
					if (!this.hasValue()) return 0;
					var s = this.value+'';
					if (s.match(/deg$/)) return this.numValue() * (Math.PI / 180.0);
					if (s.match(/grad$/)) return this.numValue() * (Math.PI / 200.0);
					if (s.match(/rad$/)) return this.numValue();
					return this.numValue() * (Math.PI / 180.0);
				}
		
		// fonts
		svg.Font = new (function() {
			this.Styles = 'normal|italic|oblique|inherit';
			this.Variants = 'normal|small-caps|inherit';
			this.Weights = 'normal|bold|bolder|lighter|100|200|300|400|500|600|700|800|900|inherit';
			
			this.CreateFont = function(fontStyle, fontVariant, fontWeight, fontSize, fontFamily, inherit) { 
				var f = inherit != null ? this.Parse(inherit) : this.CreateFont('', '', '', '', '', svg.ctx.font);
				return { 
					fontFamily: fontFamily || f.fontFamily, 
					fontSize: fontSize || f.fontSize, 
					fontStyle: fontStyle || f.fontStyle, 
					fontWeight: fontWeight || f.fontWeight, 
					fontVariant: fontVariant || f.fontVariant,
					toString: function () { return [this.fontStyle, this.fontVariant, this.fontWeight, this.fontSize, this.fontFamily].join(' ') } 
				} 
			}
			
			var that = this;
			this.Parse = function(s) {
				var f = {};
				var d = svg.trim(svg.compressSpaces(s || '')).split(' ');
				var set = { fontSize: false, fontStyle: false, fontWeight: false, fontVariant: false }
				var ff = '';
				for (var i=0; i<d.length; i++) {
					if (!set.fontStyle && that.Styles.indexOf(d[i]) != -1) { if (d[i] != 'inherit') f.fontStyle = d[i]; set.fontStyle = true; }
					else if (!set.fontVariant && that.Variants.indexOf(d[i]) != -1) { if (d[i] != 'inherit') f.fontVariant = d[i]; set.fontStyle = set.fontVariant = true;	}
					else if (!set.fontWeight && that.Weights.indexOf(d[i]) != -1) {	if (d[i] != 'inherit') f.fontWeight = d[i]; set.fontStyle = set.fontVariant = set.fontWeight = true; }
					else if (!set.fontSize) { if (d[i] != 'inherit') f.fontSize = d[i].split('/')[0]; set.fontStyle = set.fontVariant = set.fontWeight = set.fontSize = true; }
					else { if (d[i] != 'inherit') ff += d[i]; }
				} if (ff != '') f.fontFamily = ff;
				return f;
			}
		});
		
		// points and paths
		svg.ToNumberArray = function(s) {
			var a = svg.trim(svg.compressSpaces((s || '').replace(/,/g, ' '))).split(' ');
			for (var i=0; i<a.length; i++) {
				a[i] = parseFloat(a[i]);
			}
			return a;
		}		
		svg.Point = function(x, y) {
			this.x = x;
			this.y = y;
		}	
			svg.Point.prototype.angleTo = function(p) {
				return Math.atan2(p.y - this.y, p.x - this.x);
			}
			
			svg.Point.prototype.applyTransform = function(v) {
				var xp = this.x * v[0] + this.y * v[2] + v[4];
				var yp = this.x * v[1] + this.y * v[3] + v[5];
				this.x = xp;
				this.y = yp;
			}

		svg.CreatePoint = function(s) {
			var a = svg.ToNumberArray(s);
			return new svg.Point(a[0], a[1]);
		}
		svg.CreatePath = function(s) {
			var a = svg.ToNumberArray(s);
			var path = [];
			for (var i=0; i<a.length; i+=2) {
				path.push(new svg.Point(a[i], a[i+1]));
			}
			return path;
		}
		
		// bounding box
		svg.BoundingBox = function(x1, y1, x2, y2) { // pass in initial points if you want
			this.x1 = Number.NaN;
			this.y1 = Number.NaN;
			this.x2 = Number.NaN;
			this.y2 = Number.NaN;
			
			this.x = function() { return this.x1; }
			this.y = function() { return this.y1; }
			this.width = function() { return this.x2 - this.x1; }
			this.height = function() { return this.y2 - this.y1; }
			
			this.addPoint = function(x, y) {	
				if (x != null) {
					if (isNaN(this.x1) || isNaN(this.x2)) {
						this.x1 = x;
						this.x2 = x;
					}
					if (x < this.x1) this.x1 = x;
					if (x > this.x2) this.x2 = x;
				}
			
				if (y != null) {
					if (isNaN(this.y1) || isNaN(this.y2)) {
						this.y1 = y;
						this.y2 = y;
					}
					if (y < this.y1) this.y1 = y;
					if (y > this.y2) this.y2 = y;
				}
			}			
			this.addX = function(x) { this.addPoint(x, null); }
			this.addY = function(y) { this.addPoint(null, y); }
			
			this.addBoundingBox = function(bb) {
				this.addPoint(bb.x1, bb.y1);
				this.addPoint(bb.x2, bb.y2);
			}
			
			this.addQuadraticCurve = function(p0x, p0y, p1x, p1y, p2x, p2y) {
				var cp1x = p0x + 2/3 * (p1x - p0x); // CP1 = QP0 + 2/3 *(QP1-QP0)
				var cp1y = p0y + 2/3 * (p1y - p0y); // CP1 = QP0 + 2/3 *(QP1-QP0)
				var cp2x = cp1x + 1/3 * (p2x - p0x); // CP2 = CP1 + 1/3 *(QP2-QP0)
				var cp2y = cp1y + 1/3 * (p2y - p0y); // CP2 = CP1 + 1/3 *(QP2-QP0)
				this.addBezierCurve(p0x, p0y, cp1x, cp2x, cp1y,	cp2y, p2x, p2y);
			}
			
			this.addBezierCurve = function(p0x, p0y, p1x, p1y, p2x, p2y, p3x, p3y) {
				// from http://blog.hackers-cafe.net/2009/06/how-to-calculate-bezier-curves-bounding.html
				var p0 = [p0x, p0y], p1 = [p1x, p1y], p2 = [p2x, p2y], p3 = [p3x, p3y];
				this.addPoint(p0[0], p0[1]);
				this.addPoint(p3[0], p3[1]);
				
				for (i=0; i<=1; i++) {
					var f = function(t) { 
						return Math.pow(1-t, 3) * p0[i]
						+ 3 * Math.pow(1-t, 2) * t * p1[i]
						+ 3 * (1-t) * Math.pow(t, 2) * p2[i]
						+ Math.pow(t, 3) * p3[i];
					}
					
					var b = 6 * p0[i] - 12 * p1[i] + 6 * p2[i];
					var a = -3 * p0[i] + 9 * p1[i] - 9 * p2[i] + 3 * p3[i];
					var c = 3 * p1[i] - 3 * p0[i];
					
					if (a == 0) {
						if (b == 0) continue;
						var t = -c / b;
						if (0 < t && t < 1) {
							if (i == 0) this.addX(f(t));
							if (i == 1) this.addY(f(t));
						}
						continue;
					}
					
					var b2ac = Math.pow(b, 2) - 4 * c * a;
					if (b2ac < 0) continue;
					var t1 = (-b + Math.sqrt(b2ac)) / (2 * a);
					if (0 < t1 && t1 < 1) {
						if (i == 0) this.addX(f(t1));
						if (i == 1) this.addY(f(t1));
					}
					var t2 = (-b - Math.sqrt(b2ac)) / (2 * a);
					if (0 < t2 && t2 < 1) {
						if (i == 0) this.addX(f(t2));
						if (i == 1) this.addY(f(t2));
					}
				}
			}
			
			this.isPointInBox = function(x, y) {
				return (this.x1 <= x && x <= this.x2 && this.y1 <= y && y <= this.y2);
			}
			
			this.addPoint(x1, y1);
			this.addPoint(x2, y2);
		}
		
		// transforms
		svg.Transform = function(v) {	
			var that = this;
			this.Type = {}
		
			// translate
			this.Type.translate = function(s) {
				this.p = svg.CreatePoint(s);			
				this.apply = function(ctx) {
					ctx.translate(this.p.x || 0.0, this.p.y || 0.0);
				}
				this.unapply = function(ctx) {
					ctx.translate(-1.0 * this.p.x || 0.0, -1.0 * this.p.y || 0.0);
				}
				this.applyToPoint = function(p) {
					p.applyTransform([1, 0, 0, 1, this.p.x || 0.0, this.p.y || 0.0]);
				}
			}
			
			// rotate
			this.Type.rotate = function(s) {
				var a = svg.ToNumberArray(s);
				this.angle = new svg.Property('angle', a[0]);
				this.cx = a[1] || 0;
				this.cy = a[2] || 0;
				this.apply = function(ctx) {
					ctx.translate(this.cx, this.cy);
					ctx.rotate(this.angle.toRadians());
					ctx.translate(-this.cx, -this.cy);
				}
				this.unapply = function(ctx) {
					ctx.translate(this.cx, this.cy);
					ctx.rotate(-1.0 * this.angle.toRadians());
					ctx.translate(-this.cx, -this.cy);
				}
				this.applyToPoint = function(p) {
					var a = this.angle.toRadians();
					p.applyTransform([1, 0, 0, 1, this.p.x || 0.0, this.p.y || 0.0]);
					p.applyTransform([Math.cos(a), Math.sin(a), -Math.sin(a), Math.cos(a), 0, 0]);
					p.applyTransform([1, 0, 0, 1, -this.p.x || 0.0, -this.p.y || 0.0]);
				}			
			}
			
			this.Type.scale = function(s) {
				this.p = svg.CreatePoint(s);
				this.apply = function(ctx) {
					ctx.scale(this.p.x || 1.0, this.p.y || this.p.x || 1.0);
				}
				this.unapply = function(ctx) {
					ctx.scale(1.0 / this.p.x || 1.0, 1.0 / this.p.y || this.p.x || 1.0);
				}
				this.applyToPoint = function(p) {
					p.applyTransform([this.p.x || 0.0, 0, 0, this.p.y || 0.0, 0, 0]);
				}				
			}
			
			this.Type.matrix = function(s) {
				this.m = svg.ToNumberArray(s);
				this.apply = function(ctx) {
					ctx.transform(this.m[0], this.m[1], this.m[2], this.m[3], this.m[4], this.m[5]);
				}
				this.applyToPoint = function(p) {
					p.applyTransform(this.m);
				}					
			}
			
			this.Type.SkewBase = function(s) {
				this.base = that.Type.matrix;
				this.base(s);
				this.angle = new svg.Property('angle', s);
			}
			this.Type.SkewBase.prototype = new this.Type.matrix;
			
			this.Type.skewX = function(s) {
				this.base = that.Type.SkewBase;
				this.base(s);
				this.m = [1, 0, Math.tan(this.angle.toRadians()), 1, 0, 0];
			}
			this.Type.skewX.prototype = new this.Type.SkewBase;
			
			this.Type.skewY = function(s) {
				this.base = that.Type.SkewBase;
				this.base(s);
				this.m = [1, Math.tan(this.angle.toRadians()), 0, 1, 0, 0];
			}
			this.Type.skewY.prototype = new this.Type.SkewBase;
		
			this.transforms = [];
			
			this.apply = function(ctx) {
				for (var i=0; i<this.transforms.length; i++) {
					this.transforms[i].apply(ctx);
				}
			}
			
			this.unapply = function(ctx) {
				for (var i=this.transforms.length-1; i>=0; i--) {
					this.transforms[i].unapply(ctx);
				}
			}
			
			this.applyToPoint = function(p) {
				for (var i=0; i<this.transforms.length; i++) {
					this.transforms[i].applyToPoint(p);
				}
			}
			
			var data = svg.trim(svg.compressSpaces(v)).replace(/\)(\s?,\s?)/g,') ').split(/\s(?=[a-z])/);
			for (var i=0; i<data.length; i++) {
				var type = svg.trim(data[i].split('(')[0]);
				var s = data[i].split('(')[1].replace(')','');
				var transform = new this.Type[type](s);
				transform.type = type;
				this.transforms.push(transform);
			}
		}
		
		// aspect ratio
		svg.AspectRatio = function(ctx, aspectRatio, width, desiredWidth, height, desiredHeight, minX, minY, refX, refY) {
			// aspect ratio - http://www.w3.org/TR/SVG/coords.html#PreserveAspectRatioAttribute
			aspectRatio = svg.compressSpaces(aspectRatio);
			aspectRatio = aspectRatio.replace(/^defer\s/,''); // ignore defer
			var align = aspectRatio.split(' ')[0] || 'xMidYMid';
			var meetOrSlice = aspectRatio.split(' ')[1] || 'meet';					
	
			// calculate scale
			var scaleX = width / desiredWidth;
			var scaleY = height / desiredHeight;
			var scaleMin = Math.min(scaleX, scaleY);
			var scaleMax = Math.max(scaleX, scaleY);
			if (meetOrSlice == 'meet') { desiredWidth *= scaleMin; desiredHeight *= scaleMin; }
			if (meetOrSlice == 'slice') { desiredWidth *= scaleMax; desiredHeight *= scaleMax; }	
			
			refX = new svg.Property('refX', refX);
			refY = new svg.Property('refY', refY);
			if (refX.hasValue() && refY.hasValue()) {				
				ctx.translate(-scaleMin * refX.toPixels('x'), -scaleMin * refY.toPixels('y'));
			} 
			else {					
				// align
				if (align.match(/^xMid/) && ((meetOrSlice == 'meet' && scaleMin == scaleY) || (meetOrSlice == 'slice' && scaleMax == scaleY))) ctx.translate(width / 2.0 - desiredWidth / 2.0, 0); 
				if (align.match(/YMid$/) && ((meetOrSlice == 'meet' && scaleMin == scaleX) || (meetOrSlice == 'slice' && scaleMax == scaleX))) ctx.translate(0, height / 2.0 - desiredHeight / 2.0); 
				if (align.match(/^xMax/) && ((meetOrSlice == 'meet' && scaleMin == scaleY) || (meetOrSlice == 'slice' && scaleMax == scaleY))) ctx.translate(width - desiredWidth, 0); 
				if (align.match(/YMax$/) && ((meetOrSlice == 'meet' && scaleMin == scaleX) || (meetOrSlice == 'slice' && scaleMax == scaleX))) ctx.translate(0, height - desiredHeight); 
			}
			
			// scale
			if (align == 'none') ctx.scale(scaleX, scaleY);
			else if (meetOrSlice == 'meet') ctx.scale(scaleMin, scaleMin); 
			else if (meetOrSlice == 'slice') ctx.scale(scaleMax, scaleMax); 	
			
			// translate
			ctx.translate(minX == null ? 0 : -minX, minY == null ? 0 : -minY);			
		}
		
		// elements
		svg.Element = {}
		
		svg.EmptyProperty = new svg.Property('EMPTY', '');
		
		svg.Element.ElementBase = function(node) {	
			this.attributes = {};
			this.styles = {};
			this.children = [];
			
			// get or create attribute
			this.attribute = function(name, createIfNotExists) {
				var a = this.attributes[name];
				if (a != null) return a;
							
				if (createIfNotExists == true) { a = new svg.Property(name, ''); this.attributes[name] = a; }
				return a || svg.EmptyProperty;
			}
			
			this.getHrefAttribute = function() {
				for (var a in this.attributes) { 
					if (a.match(/:href$/)) { 
						return this.attributes[a]; 
					} 
				}
				return svg.EmptyProperty;
			}
			
			// get or create style, crawls up node tree
			this.style = function(name, createIfNotExists) {
				var s = this.styles[name];
				if (s != null) return s;
				
				var a = this.attribute(name);
				if (a != null && a.hasValue()) {
					this.styles[name] = a; // move up to me to cache
					return a;
				}
				
				var p = this.parent;
				if (p != null) {
					var ps = p.style(name);
					if (ps != null && ps.hasValue()) {
						return ps;
					}
				}
					
				if (createIfNotExists == true) { s = new svg.Property(name, ''); this.styles[name] = s; }
				return s || svg.EmptyProperty;
			}
			
			// base render
			this.render = function(ctx) {
				// don't render display=none
				if (this.style('display').value == 'none') return;
				
				// don't render visibility=hidden
				if (this.attribute('visibility').value == 'hidden') return;
			
				ctx.save();
				if (this.attribute('mask').hasValue()) { // mask
					var mask = this.attribute('mask').getDefinition();
					if (mask != null) mask.apply(ctx, this);
				}
				else if (this.style('filter').hasValue()) { // filter
					var filter = this.style('filter').getDefinition();
					if (filter != null) filter.apply(ctx, this);
				}
				else {	
					this.setContext(ctx);
					this.renderChildren(ctx);	
					this.clearContext(ctx);							
				}
				ctx.restore();
			}
			
			// base set context
			this.setContext = function(ctx) {
				// OVERRIDE ME!
			}
			
			// base clear context
			this.clearContext = function(ctx) {
				// OVERRIDE ME!
			}			
			
			// base render children
			this.renderChildren = function(ctx) {
				for (var i=0; i<this.children.length; i++) {
					this.children[i].render(ctx);
				}
			}
			
			this.addChild = function(childNode, create) {
				var child = childNode;
				if (create) child = svg.CreateElement(childNode);
				child.parent = this;
				this.children.push(child);			
			}
				
			if (node != null && node.nodeType == 1) { //ELEMENT_NODE
				// add children
				for (var i=0; i<node.childNodes.length; i++) {
					var childNode = node.childNodes[i];
					if (childNode.nodeType == 1) this.addChild(childNode, true); //ELEMENT_NODE
					if (this.captureTextNodes && childNode.nodeType == 3) {
						var text = childNode.nodeValue || childNode.text || '';
						if (svg.trim(svg.compressSpaces(text)) != '') {
							this.addChild(new svg.Element.tspan(childNode), false); // TEXT_NODE
						}
					}
				}
				
				// add attributes
				for (var i=0; i<node.attributes.length; i++) {
					var attribute = node.attributes[i];
					this.attributes[attribute.nodeName] = new svg.Property(attribute.nodeName, attribute.nodeValue);
				}
										
				// add tag styles
				var styles = svg.Styles[node.nodeName];
				if (styles != null) {
					for (var name in styles) {
						this.styles[name] = styles[name];
					}
				}					
				
				// add class styles
				if (this.attribute('class').hasValue()) {
					var classes = svg.compressSpaces(this.attribute('class').value).split(' ');
					for (var j=0; j<classes.length; j++) {
						styles = svg.Styles['.'+classes[j]];
						if (styles != null) {
							for (var name in styles) {
								this.styles[name] = styles[name];
							}
						}
						styles = svg.Styles[node.nodeName+'.'+classes[j]];
						if (styles != null) {
							for (var name in styles) {
								this.styles[name] = styles[name];
							}
						}
					}
				}
				
				// add id styles
				if (this.attribute('id').hasValue()) {
					var styles = svg.Styles['#' + this.attribute('id').value];
					if (styles != null) {
						for (var name in styles) {
							this.styles[name] = styles[name];
						}
					}
				}
				
				// add inline styles
				if (this.attribute('style').hasValue()) {
					var styles = this.attribute('style').value.split(';');
					for (var i=0; i<styles.length; i++) {
						if (svg.trim(styles[i]) != '') {
							var style = styles[i].split(':');
							var name = svg.trim(style[0]);
							var value = svg.trim(style[1]);
							this.styles[name] = new svg.Property(name, value);
						}
					}
				}	

				// add id
				if (this.attribute('id').hasValue()) {
					if (svg.Definitions[this.attribute('id').value] == null) {
						svg.Definitions[this.attribute('id').value] = this;
					}
				}
			}
		}
		
		svg.Element.RenderedElementBase = function(node) {
			this.base = svg.Element.ElementBase;
			this.base(node);
			
			this.setContext = function(ctx) {
				// fill
				if (this.style('fill').isUrlDefinition()) {
					var fs = this.style('fill').getFillStyleDefinition(this, this.style('fill-opacity'));
					if (fs != null) ctx.fillStyle = fs;
				}
				else if (this.style('fill').hasValue()) {
					var fillStyle = this.style('fill');
					if (fillStyle.value == 'currentColor') fillStyle.value = this.style('color').value;
					ctx.fillStyle = (fillStyle.value == 'none' ? 'rgba(0,0,0,0)' : fillStyle.value);
				}
				if (this.style('fill-opacity').hasValue()) {
					var fillStyle = new svg.Property('fill', ctx.fillStyle);
					fillStyle = fillStyle.addOpacity(this.style('fill-opacity').value);
					ctx.fillStyle = fillStyle.value;
				}
									
				// stroke
				if (this.style('stroke').isUrlDefinition()) {
					var fs = this.style('stroke').getFillStyleDefinition(this, this.style('stroke-opacity'));
					if (fs != null) ctx.strokeStyle = fs;
				}
				else if (this.style('stroke').hasValue()) {
					var strokeStyle = this.style('stroke');
					if (strokeStyle.value == 'currentColor') strokeStyle.value = this.style('color').value;
					ctx.strokeStyle = (strokeStyle.value == 'none' ? 'rgba(0,0,0,0)' : strokeStyle.value);
				}
				if (this.style('stroke-opacity').hasValue()) {
					var strokeStyle = new svg.Property('stroke', ctx.strokeStyle);
					strokeStyle = strokeStyle.addOpacity(this.style('stroke-opacity').value);
					ctx.strokeStyle = strokeStyle.value;
				}
				if (this.style('stroke-width').hasValue()) {
					var newLineWidth = this.style('stroke-width').toPixels();
					ctx.lineWidth = newLineWidth == 0 ? 0.001 : newLineWidth; // browsers don't respect 0
			    }
				if (this.style('stroke-linecap').hasValue()) ctx.lineCap = this.style('stroke-linecap').value;
				if (this.style('stroke-linejoin').hasValue()) ctx.lineJoin = this.style('stroke-linejoin').value;
				if (this.style('stroke-miterlimit').hasValue()) ctx.miterLimit = this.style('stroke-miterlimit').value;
				if (this.style('stroke-dasharray').hasValue()) {
					var gaps = svg.ToNumberArray(this.style('stroke-dasharray').value);
					if (typeof(ctx.setLineDash) != 'undefined') { ctx.setLineDash(gaps); }
					else if (typeof(ctx.webkitLineDash) != 'undefined') { ctx.webkitLineDash = gaps; }
					else if (typeof(ctx.mozDash ) != 'undefined') { ctx.mozDash  = gaps; }
					
					var offset = this.style('stroke-dashoffset').numValueOrDefault(1);
					if (typeof(ctx.lineDashOffset) != 'undefined') { ctx.lineDashOffset = offset; }
					else if (typeof(ctx.webkitLineDashOffset) != 'undefined') { ctx.webkitLineDashOffset = offset; }
					else if (typeof(ctx.mozDashOffset) != 'undefined') { ctx.mozDashOffset = offset; }
				}

				// font
				if (typeof(ctx.font) != 'undefined') {
					ctx.font = svg.Font.CreateFont( 
						this.style('font-style').value, 
						this.style('font-variant').value, 
						this.style('font-weight').value, 
						this.style('font-size').hasValue() ? this.style('font-size').toPixels() + 'px' : '', 
						this.style('font-family').value).toString();
				}
				
				// transform
				if (this.attribute('transform').hasValue()) { 
					var transform = new svg.Transform(this.attribute('transform').value);
					transform.apply(ctx);
				}
				
				// clip
				if (this.style('clip-path').hasValue()) {
					var clip = this.style('clip-path').getDefinition();
					if (clip != null) clip.apply(ctx);
				}
				
				// opacity
				if (this.style('opacity').hasValue()) {
					ctx.globalAlpha = this.style('opacity').numValue();
				}
			}		
		}
		svg.Element.RenderedElementBase.prototype = new svg.Element.ElementBase;
		
		svg.Element.PathElementBase = function(node) {
			this.base = svg.Element.RenderedElementBase;
			this.base(node);
			
			this.path = function(ctx) {
				if (ctx != null) ctx.beginPath();
				return new svg.BoundingBox();
			}
			
			this.renderChildren = function(ctx) {
				this.path(ctx);
				svg.Mouse.checkPath(this, ctx);
				if (ctx.fillStyle != '') {
					if (this.attribute('fill-rule').hasValue()) { ctx.fill(this.attribute('fill-rule').value); }
					else { ctx.fill(); }
				}
				if (ctx.strokeStyle != '') ctx.stroke();
				
				var markers = this.getMarkers();
				if (markers != null) {
					if (this.style('marker-start').isUrlDefinition()) {
						var marker = this.style('marker-start').getDefinition();
						marker.render(ctx, markers[0][0], markers[0][1]);
					}
					if (this.style('marker-mid').isUrlDefinition()) {
						var marker = this.style('marker-mid').getDefinition();
						for (var i=1;i<markers.length-1;i++) {
							marker.render(ctx, markers[i][0], markers[i][1]);
						}
					}
					if (this.style('marker-end').isUrlDefinition()) {
						var marker = this.style('marker-end').getDefinition();
						marker.render(ctx, markers[markers.length-1][0], markers[markers.length-1][1]);
					}
				}					
			}
			
			this.getBoundingBox = function() {
				return this.path();
			}
			
			this.getMarkers = function() {
				return null;
			}
		}
		svg.Element.PathElementBase.prototype = new svg.Element.RenderedElementBase;
		
		// svg element
		svg.Element.svg = function(node) {
			this.base = svg.Element.RenderedElementBase;
			this.base(node);
			
			this.baseClearContext = this.clearContext;
			this.clearContext = function(ctx) {
				this.baseClearContext(ctx);
				svg.ViewPort.RemoveCurrent();
			}
			
			this.baseSetContext = this.setContext;
			this.setContext = function(ctx) {
				// initial values
				ctx.strokeStyle = 'rgba(0,0,0,0)';
				ctx.lineCap = 'butt';
				ctx.lineJoin = 'miter';
				ctx.miterLimit = 4;			
			
				this.baseSetContext(ctx);
				
				// create new view port
				if (!this.attribute('x').hasValue()) this.attribute('x', true).value = 0;
				if (!this.attribute('y').hasValue()) this.attribute('y', true).value = 0;
				ctx.translate(this.attribute('x').toPixels('x'), this.attribute('y').toPixels('y'));
				
				var width = svg.ViewPort.width();
				var height = svg.ViewPort.height();
				
				if (!this.attribute('width').hasValue()) this.attribute('width', true).value = '100%';
				if (!this.attribute('height').hasValue()) this.attribute('height', true).value = '100%';
				if (typeof(this.root) == 'undefined') {
					width = this.attribute('width').toPixels('x');
					height = this.attribute('height').toPixels('y');
					
					var x = 0;
					var y = 0;
					if (this.attribute('refX').hasValue() && this.attribute('refY').hasValue()) {
						x = -this.attribute('refX').toPixels('x');
						y = -this.attribute('refY').toPixels('y');
					}
					
					ctx.beginPath();
					ctx.moveTo(x, y);
					ctx.lineTo(width, y);
					ctx.lineTo(width, height);
					ctx.lineTo(x, height);
					ctx.closePath();
					ctx.clip();
				}
				svg.ViewPort.SetCurrent(width, height);	
						
				// viewbox
				if (this.attribute('viewBox').hasValue()) {				
					var viewBox = svg.ToNumberArray(this.attribute('viewBox').value);
					var minX = viewBox[0];
					var minY = viewBox[1];
					width = viewBox[2];
					height = viewBox[3];
					
					svg.AspectRatio(ctx,
									this.attribute('preserveAspectRatio').value, 
									svg.ViewPort.width(), 
									width,
									svg.ViewPort.height(),
									height,
									minX,
									minY,
									this.attribute('refX').value,
									this.attribute('refY').value);
										
					svg.ViewPort.RemoveCurrent();	
					svg.ViewPort.SetCurrent(viewBox[2], viewBox[3]);						
				}				
			}
		}
		svg.Element.svg.prototype = new svg.Element.RenderedElementBase;

		// rect element
		svg.Element.rect = function(node) {
			this.base = svg.Element.PathElementBase;
			this.base(node);
			
			this.path = function(ctx) {
				var x = this.attribute('x').toPixels('x');
				var y = this.attribute('y').toPixels('y');
				var width = this.attribute('width').toPixels('x');
				var height = this.attribute('height').toPixels('y');
				var rx = this.attribute('rx').toPixels('x');
				var ry = this.attribute('ry').toPixels('y');
				if (this.attribute('rx').hasValue() && !this.attribute('ry').hasValue()) ry = rx;
				if (this.attribute('ry').hasValue() && !this.attribute('rx').hasValue()) rx = ry;
				rx = Math.min(rx, width / 2.0);
				ry = Math.min(ry, height / 2.0);
				if (ctx != null) {
					ctx.beginPath();
					ctx.moveTo(x + rx, y);
					ctx.lineTo(x + width - rx, y);
					ctx.quadraticCurveTo(x + width, y, x + width, y + ry)
					ctx.lineTo(x + width, y + height - ry);
					ctx.quadraticCurveTo(x + width, y + height, x + width - rx, y + height)
					ctx.lineTo(x + rx, y + height);
					ctx.quadraticCurveTo(x, y + height, x, y + height - ry)
					ctx.lineTo(x, y + ry);
					ctx.quadraticCurveTo(x, y, x + rx, y)
					ctx.closePath();
				}
				
				return new svg.BoundingBox(x, y, x + width, y + height);
			}
		}
		svg.Element.rect.prototype = new svg.Element.PathElementBase;
		
		// circle element
		svg.Element.circle = function(node) {
			this.base = svg.Element.PathElementBase;
			this.base(node);
			
			this.path = function(ctx) {
				var cx = this.attribute('cx').toPixels('x');
				var cy = this.attribute('cy').toPixels('y');
				var r = this.attribute('r').toPixels();
			
				if (ctx != null) {
					ctx.beginPath();
					ctx.arc(cx, cy, r, 0, Math.PI * 2, true); 
					ctx.closePath();
				}
				
				return new svg.BoundingBox(cx - r, cy - r, cx + r, cy + r);
			}
		}
		svg.Element.circle.prototype = new svg.Element.PathElementBase;	

		// ellipse element
		svg.Element.ellipse = function(node) {
			this.base = svg.Element.PathElementBase;
			this.base(node);
			
			this.path = function(ctx) {
				var KAPPA = 4 * ((Math.sqrt(2) - 1) / 3);
				var rx = this.attribute('rx').toPixels('x');
				var ry = this.attribute('ry').toPixels('y');
				var cx = this.attribute('cx').toPixels('x');
				var cy = this.attribute('cy').toPixels('y');
				
				if (ctx != null) {
					ctx.beginPath();
					ctx.moveTo(cx, cy - ry);
					ctx.bezierCurveTo(cx + (KAPPA * rx), cy - ry,  cx + rx, cy - (KAPPA * ry), cx + rx, cy);
					ctx.bezierCurveTo(cx + rx, cy + (KAPPA * ry), cx + (KAPPA * rx), cy + ry, cx, cy + ry);
					ctx.bezierCurveTo(cx - (KAPPA * rx), cy + ry, cx - rx, cy + (KAPPA * ry), cx - rx, cy);
					ctx.bezierCurveTo(cx - rx, cy - (KAPPA * ry), cx - (KAPPA * rx), cy - ry, cx, cy - ry);
					ctx.closePath();
				}
				
				return new svg.BoundingBox(cx - rx, cy - ry, cx + rx, cy + ry);
			}
		}
		svg.Element.ellipse.prototype = new svg.Element.PathElementBase;			
		
		// line element
		svg.Element.line = function(node) {
			this.base = svg.Element.PathElementBase;
			this.base(node);
			
			this.getPoints = function() {
				return [
					new svg.Point(this.attribute('x1').toPixels('x'), this.attribute('y1').toPixels('y')),
					new svg.Point(this.attribute('x2').toPixels('x'), this.attribute('y2').toPixels('y'))];
			}
								
			this.path = function(ctx) {
				var points = this.getPoints();
				
				if (ctx != null) {
					ctx.beginPath();
					ctx.moveTo(points[0].x, points[0].y);
					ctx.lineTo(points[1].x, points[1].y);
				}
				
				return new svg.BoundingBox(points[0].x, points[0].y, points[1].x, points[1].y);
			}
			
			this.getMarkers = function() {
				var points = this.getPoints();	
				var a = points[0].angleTo(points[1]);
				return [[points[0], a], [points[1], a]];
			}
		}
		svg.Element.line.prototype = new svg.Element.PathElementBase;		
				
		// polyline element
		svg.Element.polyline = function(node) {
			this.base = svg.Element.PathElementBase;
			this.base(node);
			
			this.points = svg.CreatePath(this.attribute('points').value);
			this.path = function(ctx) {
				var bb = new svg.BoundingBox(this.points[0].x, this.points[0].y);
				if (ctx != null) {
					ctx.beginPath();
					ctx.moveTo(this.points[0].x, this.points[0].y);
				}
				for (var i=1; i<this.points.length; i++) {
					bb.addPoint(this.points[i].x, this.points[i].y);
					if (ctx != null) ctx.lineTo(this.points[i].x, this.points[i].y);
				}
				return bb;
			}
			
			this.getMarkers = function() {
				var markers = [];
				for (var i=0; i<this.points.length - 1; i++) {
					markers.push([this.points[i], this.points[i].angleTo(this.points[i+1])]);
				}
				markers.push([this.points[this.points.length-1], markers[markers.length-1][1]]);
				return markers;
			}			
		}
		svg.Element.polyline.prototype = new svg.Element.PathElementBase;				
				
		// polygon element
		svg.Element.polygon = function(node) {
			this.base = svg.Element.polyline;
			this.base(node);
			
			this.basePath = this.path;
			this.path = function(ctx) {
				var bb = this.basePath(ctx);
				if (ctx != null) {
					ctx.lineTo(this.points[0].x, this.points[0].y);
					ctx.closePath();
				}
				return bb;
			}
		}
		svg.Element.polygon.prototype = new svg.Element.polyline;

		// path element
		svg.Element.path = function(node) {
			this.base = svg.Element.PathElementBase;
			this.base(node);
					
			var d = this.attribute('d').value;
			// TODO: convert to real lexer based on http://www.w3.org/TR/SVG11/paths.html#PathDataBNF
			d = d.replace(/,/gm,' '); // get rid of all commas
			d = d.replace(/([MmZzLlHhVvCcSsQqTtAa])([MmZzLlHhVvCcSsQqTtAa])/gm,'$1 $2'); // separate commands from commands
			d = d.replace(/([MmZzLlHhVvCcSsQqTtAa])([MmZzLlHhVvCcSsQqTtAa])/gm,'$1 $2'); // separate commands from commands
			d = d.replace(/([MmZzLlHhVvCcSsQqTtAa])([^\s])/gm,'$1 $2'); // separate commands from points
			d = d.replace(/([^\s])([MmZzLlHhVvCcSsQqTtAa])/gm,'$1 $2'); // separate commands from points
			d = d.replace(/([0-9])([+\-])/gm,'$1 $2'); // separate digits when no comma
			d = d.replace(/(\.[0-9]*)(\.)/gm,'$1 $2'); // separate digits when no comma
			d = d.replace(/([Aa](\s+[0-9]+){3})\s+([01])\s*([01])/gm,'$1 $3 $4 '); // shorthand elliptical arc path syntax
			d = svg.compressSpaces(d); // compress multiple spaces
			d = svg.trim(d);
			this.PathParser = new (function(d) {
				this.tokens = d.split(' ');
				
				this.reset = function() {
					this.i = -1;
					this.command = '';
					this.previousCommand = '';
					this.start = new svg.Point(0, 0);
					this.control = new svg.Point(0, 0);
					this.current = new svg.Point(0, 0);
					this.points = [];
					this.angles = [];
				}
								
				this.isEnd = function() {
					return this.i >= this.tokens.length - 1;
				}
				
				this.isCommandOrEnd = function() {
					if (this.isEnd()) return true;
					return this.tokens[this.i + 1].match(/^[A-Za-z]$/) != null;
				}
				
				this.isRelativeCommand = function() {
					switch(this.command)
					{
						case 'm':
						case 'l':
						case 'h':
						case 'v':
						case 'c':
						case 's':
						case 'q':
						case 't':
						case 'a':
						case 'z':
							return true;
							break;
					}
					return false;
				}
							
				this.getToken = function() {
					this.i++;
					return this.tokens[this.i];
				}
				
				this.getScalar = function() {
					return parseFloat(this.getToken());
				}
				
				this.nextCommand = function() {
					this.previousCommand = this.command;
					this.command = this.getToken();
				}				
				
				this.getPoint = function() {
					var p = new svg.Point(this.getScalar(), this.getScalar());
					return this.makeAbsolute(p);
				}
				
				this.getAsControlPoint = function() {
					var p = this.getPoint();
					this.control = p;
					return p;
				}
				
				this.getAsCurrentPoint = function() {
					var p = this.getPoint();
					this.current = p;
					return p;	
				}
				
				this.getReflectedControlPoint = function() {
					if (this.previousCommand.toLowerCase() != 'c' && 
					    this.previousCommand.toLowerCase() != 's' &&
						this.previousCommand.toLowerCase() != 'q' && 
						this.previousCommand.toLowerCase() != 't' ){
						return this.current;
					}
					
					// reflect point
					var p = new svg.Point(2 * this.current.x - this.control.x, 2 * this.current.y - this.control.y);					
					return p;
				}
				
				this.makeAbsolute = function(p) {
					if (this.isRelativeCommand()) {
						p.x += this.current.x;
						p.y += this.current.y;
					}
					return p;
				}
				
				this.addMarker = function(p, from, priorTo) {
					// if the last angle isn't filled in because we didn't have this point yet ...
					if (priorTo != null && this.angles.length > 0 && this.angles[this.angles.length-1] == null) {
						this.angles[this.angles.length-1] = this.points[this.points.length-1].angleTo(priorTo);
					}
					this.addMarkerAngle(p, from == null ? null : from.angleTo(p));
				}
				
				this.addMarkerAngle = function(p, a) {
					this.points.push(p);
					this.angles.push(a);
				}				
				
				this.getMarkerPoints = function() { return this.points; }
				this.getMarkerAngles = function() {
					for (var i=0; i<this.angles.length; i++) {
						if (this.angles[i] == null) {
							for (var j=i+1; j<this.angles.length; j++) {
								if (this.angles[j] != null) {
									this.angles[i] = this.angles[j];
									break;
								}
							}
						}
					}
					return this.angles;
				}
			})(d);

			this.path = function(ctx) {
				var pp = this.PathParser;
				pp.reset();

				var bb = new svg.BoundingBox();
				if (ctx != null) ctx.beginPath();
				while (!pp.isEnd()) {
					pp.nextCommand();
					switch (pp.command) {
					case 'M':
					case 'm':
						var p = pp.getAsCurrentPoint();
						pp.addMarker(p);
						bb.addPoint(p.x, p.y);
						if (ctx != null) ctx.moveTo(p.x, p.y);
						pp.start = pp.current;
						while (!pp.isCommandOrEnd()) {
							var p = pp.getAsCurrentPoint();
							pp.addMarker(p, pp.start);
							bb.addPoint(p.x, p.y);
							if (ctx != null) ctx.lineTo(p.x, p.y);
						}
						break;
					case 'L':
					case 'l':
						while (!pp.isCommandOrEnd()) {
							var c = pp.current;
							var p = pp.getAsCurrentPoint();
							pp.addMarker(p, c);
							bb.addPoint(p.x, p.y);
							if (ctx != null) ctx.lineTo(p.x, p.y);
						}
						break;
					case 'H':
					case 'h':
						while (!pp.isCommandOrEnd()) {
							var newP = new svg.Point((pp.isRelativeCommand() ? pp.current.x : 0) + pp.getScalar(), pp.current.y);
							pp.addMarker(newP, pp.current);
							pp.current = newP;
							bb.addPoint(pp.current.x, pp.current.y);
							if (ctx != null) ctx.lineTo(pp.current.x, pp.current.y);
						}
						break;
					case 'V':
					case 'v':
						while (!pp.isCommandOrEnd()) {
							var newP = new svg.Point(pp.current.x, (pp.isRelativeCommand() ? pp.current.y : 0) + pp.getScalar());
							pp.addMarker(newP, pp.current);
							pp.current = newP;
							bb.addPoint(pp.current.x, pp.current.y);
							if (ctx != null) ctx.lineTo(pp.current.x, pp.current.y);
						}
						break;
					case 'C':
					case 'c':
						while (!pp.isCommandOrEnd()) {
							var curr = pp.current;
							var p1 = pp.getPoint();
							var cntrl = pp.getAsControlPoint();
							var cp = pp.getAsCurrentPoint();
							pp.addMarker(cp, cntrl, p1);
							bb.addBezierCurve(curr.x, curr.y, p1.x, p1.y, cntrl.x, cntrl.y, cp.x, cp.y);
							if (ctx != null) ctx.bezierCurveTo(p1.x, p1.y, cntrl.x, cntrl.y, cp.x, cp.y);
						}
						break;
					case 'S':
					case 's':
						while (!pp.isCommandOrEnd()) {
							var curr = pp.current;
							var p1 = pp.getReflectedControlPoint();
							var cntrl = pp.getAsControlPoint();
							var cp = pp.getAsCurrentPoint();
							pp.addMarker(cp, cntrl, p1);
							bb.addBezierCurve(curr.x, curr.y, p1.x, p1.y, cntrl.x, cntrl.y, cp.x, cp.y);
							if (ctx != null) ctx.bezierCurveTo(p1.x, p1.y, cntrl.x, cntrl.y, cp.x, cp.y);
						}
						break;
					case 'Q':
					case 'q':
						while (!pp.isCommandOrEnd()) {
							var curr = pp.current;
							var cntrl = pp.getAsControlPoint();
							var cp = pp.getAsCurrentPoint();
							pp.addMarker(cp, cntrl, cntrl);
							bb.addQuadraticCurve(curr.x, curr.y, cntrl.x, cntrl.y, cp.x, cp.y);
							if (ctx != null) ctx.quadraticCurveTo(cntrl.x, cntrl.y, cp.x, cp.y);
						}
						break;
					case 'T':
					case 't':
						while (!pp.isCommandOrEnd()) {
							var curr = pp.current;
							var cntrl = pp.getReflectedControlPoint();
							pp.control = cntrl;
							var cp = pp.getAsCurrentPoint();
							pp.addMarker(cp, cntrl, cntrl);
							bb.addQuadraticCurve(curr.x, curr.y, cntrl.x, cntrl.y, cp.x, cp.y);
							if (ctx != null) ctx.quadraticCurveTo(cntrl.x, cntrl.y, cp.x, cp.y);
						}
						break;
					case 'A':
					case 'a':
						while (!pp.isCommandOrEnd()) {
						    var curr = pp.current;
							var rx = pp.getScalar();
							var ry = pp.getScalar();
							var xAxisRotation = pp.getScalar() * (Math.PI / 180.0);
							var largeArcFlag = pp.getScalar();
							var sweepFlag = pp.getScalar();
							var cp = pp.getAsCurrentPoint();

							// Conversion from endpoint to center parameterization
							// http://www.w3.org/TR/SVG11/implnote.html#ArcImplementationNotes
							// x1', y1'
							var currp = new svg.Point(
								Math.cos(xAxisRotation) * (curr.x - cp.x) / 2.0 + Math.sin(xAxisRotation) * (curr.y - cp.y) / 2.0,
								-Math.sin(xAxisRotation) * (curr.x - cp.x) / 2.0 + Math.cos(xAxisRotation) * (curr.y - cp.y) / 2.0
							);
							// adjust radii
							var l = Math.pow(currp.x,2)/Math.pow(rx,2)+Math.pow(currp.y,2)/Math.pow(ry,2);
							if (l > 1) {
								rx *= Math.sqrt(l);
								ry *= Math.sqrt(l);
							}
							// cx', cy'
							var s = (largeArcFlag == sweepFlag ? -1 : 1) * Math.sqrt(
								((Math.pow(rx,2)*Math.pow(ry,2))-(Math.pow(rx,2)*Math.pow(currp.y,2))-(Math.pow(ry,2)*Math.pow(currp.x,2))) /
								(Math.pow(rx,2)*Math.pow(currp.y,2)+Math.pow(ry,2)*Math.pow(currp.x,2))
							);
							if (isNaN(s)) s = 0;
							var cpp = new svg.Point(s * rx * currp.y / ry, s * -ry * currp.x / rx);
							// cx, cy
							var centp = new svg.Point(
								(curr.x + cp.x) / 2.0 + Math.cos(xAxisRotation) * cpp.x - Math.sin(xAxisRotation) * cpp.y,
								(curr.y + cp.y) / 2.0 + Math.sin(xAxisRotation) * cpp.x + Math.cos(xAxisRotation) * cpp.y
							);
							// vector magnitude
							var m = function(v) { return Math.sqrt(Math.pow(v[0],2) + Math.pow(v[1],2)); }
							// ratio between two vectors
							var r = function(u, v) { return (u[0]*v[0]+u[1]*v[1]) / (m(u)*m(v)) }
							// angle between two vectors
							var a = function(u, v) { return (u[0]*v[1] < u[1]*v[0] ? -1 : 1) * Math.acos(r(u,v)); }
							// initial angle
							var a1 = a([1,0], [(currp.x-cpp.x)/rx,(currp.y-cpp.y)/ry]);
							// angle delta
							var u = [(currp.x-cpp.x)/rx,(currp.y-cpp.y)/ry];
							var v = [(-currp.x-cpp.x)/rx,(-currp.y-cpp.y)/ry];
							var ad = a(u, v);
							if (r(u,v) <= -1) ad = Math.PI;
							if (r(u,v) >= 1) ad = 0;

							// for markers
							var dir = 1 - sweepFlag ? 1.0 : -1.0;
							var ah = a1 + dir * (ad / 2.0);
							var halfWay = new svg.Point(
								centp.x + rx * Math.cos(ah),
								centp.y + ry * Math.sin(ah)
							);
							pp.addMarkerAngle(halfWay, ah - dir * Math.PI / 2);
							pp.addMarkerAngle(cp, ah - dir * Math.PI);

							bb.addPoint(cp.x, cp.y); // TODO: this is too naive, make it better
							if (ctx != null) {
								var r = rx > ry ? rx : ry;
								var sx = rx > ry ? 1 : rx / ry;
								var sy = rx > ry ? ry / rx : 1;

								ctx.translate(centp.x, centp.y);
								ctx.rotate(xAxisRotation);
								ctx.scale(sx, sy);
								ctx.arc(0, 0, r, a1, a1 + ad, 1 - sweepFlag);
								ctx.scale(1/sx, 1/sy);
								ctx.rotate(-xAxisRotation);
								ctx.translate(-centp.x, -centp.y);
							}
						}
						break;
					case 'Z':
					case 'z':
						if (ctx != null) ctx.closePath();
						pp.current = pp.start;
					}
				}

				return bb;
			}

			this.getMarkers = function() {
				var points = this.PathParser.getMarkerPoints();
				var angles = this.PathParser.getMarkerAngles();
				
				var markers = [];
				for (var i=0; i<points.length; i++) {
					markers.push([points[i], angles[i]]);
				}
				return markers;
			}
		}
		svg.Element.path.prototype = new svg.Element.PathElementBase;
		
		// pattern element
		svg.Element.pattern = function(node) {
			this.base = svg.Element.ElementBase;
			this.base(node);
			
			this.createPattern = function(ctx, element) {
				var width = this.attribute('width').toPixels('x', true);
				var height = this.attribute('height').toPixels('y', true);
			
				// render me using a temporary svg element
				var tempSvg = new svg.Element.svg();
				tempSvg.attributes['viewBox'] = new svg.Property('viewBox', this.attribute('viewBox').value);
				tempSvg.attributes['width'] = new svg.Property('width', width + 'px');
				tempSvg.attributes['height'] = new svg.Property('height', height + 'px');
				tempSvg.attributes['transform'] = new svg.Property('transform', this.attribute('patternTransform').value);
				tempSvg.children = this.children;
				
				var c = document.createElement('canvas');
				c.width = width;
				c.height = height;
				var cctx = c.getContext('2d');
				if (this.attribute('x').hasValue() && this.attribute('y').hasValue()) {
					cctx.translate(this.attribute('x').toPixels('x', true), this.attribute('y').toPixels('y', true));
				}
				// render 3x3 grid so when we transform there's no white space on edges
				for (var x=-1; x<=1; x++) {
					for (var y=-1; y<=1; y++) {
						cctx.save();
						cctx.translate(x * c.width, y * c.height);
						tempSvg.render(cctx);
						cctx.restore();
					}
				}
				var pattern = ctx.createPattern(c, 'repeat');
				return pattern;
			}
		}
		svg.Element.pattern.prototype = new svg.Element.ElementBase;
		
		// marker element
		svg.Element.marker = function(node) {
			this.base = svg.Element.ElementBase;
			this.base(node);
			
			this.baseRender = this.render;
			this.render = function(ctx, point, angle) {
				ctx.translate(point.x, point.y);
				if (this.attribute('orient').valueOrDefault('auto') == 'auto') ctx.rotate(angle);
				if (this.attribute('markerUnits').valueOrDefault('strokeWidth') == 'strokeWidth') ctx.scale(ctx.lineWidth, ctx.lineWidth);
				ctx.save();
							
				// render me using a temporary svg element
				var tempSvg = new svg.Element.svg();
				tempSvg.attributes['viewBox'] = new svg.Property('viewBox', this.attribute('viewBox').value);
				tempSvg.attributes['refX'] = new svg.Property('refX', this.attribute('refX').value);
				tempSvg.attributes['refY'] = new svg.Property('refY', this.attribute('refY').value);
				tempSvg.attributes['width'] = new svg.Property('width', this.attribute('markerWidth').value);
				tempSvg.attributes['height'] = new svg.Property('height', this.attribute('markerHeight').value);
				tempSvg.attributes['fill'] = new svg.Property('fill', this.attribute('fill').valueOrDefault('black'));
				tempSvg.attributes['stroke'] = new svg.Property('stroke', this.attribute('stroke').valueOrDefault('none'));
				tempSvg.children = this.children;
				tempSvg.render(ctx);
				
				ctx.restore();
				if (this.attribute('markerUnits').valueOrDefault('strokeWidth') == 'strokeWidth') ctx.scale(1/ctx.lineWidth, 1/ctx.lineWidth);
				if (this.attribute('orient').valueOrDefault('auto') == 'auto') ctx.rotate(-angle);
				ctx.translate(-point.x, -point.y);
			}
		}
		svg.Element.marker.prototype = new svg.Element.ElementBase;
		
		// definitions element
		svg.Element.defs = function(node) {
			this.base = svg.Element.ElementBase;
			this.base(node);	
			
			this.render = function(ctx) {
				// NOOP
			}
		}
		svg.Element.defs.prototype = new svg.Element.ElementBase;
		
		// base for gradients
		svg.Element.GradientBase = function(node) {
			this.base = svg.Element.ElementBase;
			this.base(node);
			
			this.gradientUnits = this.attribute('gradientUnits').valueOrDefault('objectBoundingBox');
			
			this.stops = [];			
			for (var i=0; i<this.children.length; i++) {
				var child = this.children[i];
				if (child.type == 'stop') this.stops.push(child);
			}	
			
			this.getGradient = function() {
				// OVERRIDE ME!
			}			

			this.createGradient = function(ctx, element, parentOpacityProp) {
				var stopsContainer = this;
				if (this.getHrefAttribute().hasValue()) {
					stopsContainer = this.getHrefAttribute().getDefinition();
				}
				
				var addParentOpacity = function (color) {
					if (parentOpacityProp.hasValue()) {
						var p = new svg.Property('color', color);
						return p.addOpacity(parentOpacityProp.value).value;
					}
					return color;
				};
			
				var g = this.getGradient(ctx, element);
				if (g == null) return addParentOpacity(stopsContainer.stops[stopsContainer.stops.length - 1].color);
				for (var i=0; i<stopsContainer.stops.length; i++) {
					g.addColorStop(stopsContainer.stops[i].offset, addParentOpacity(stopsContainer.stops[i].color));
				}
				
				if (this.attribute('gradientTransform').hasValue()) {
					// render as transformed pattern on temporary canvas
					var rootView = svg.ViewPort.viewPorts[0];
					
					var rect = new svg.Element.rect();
					rect.attributes['x'] = new svg.Property('x', -svg.MAX_VIRTUAL_PIXELS/3.0);
					rect.attributes['y'] = new svg.Property('y', -svg.MAX_VIRTUAL_PIXELS/3.0);
					rect.attributes['width'] = new svg.Property('width', svg.MAX_VIRTUAL_PIXELS);
					rect.attributes['height'] = new svg.Property('height', svg.MAX_VIRTUAL_PIXELS);
					
					var group = new svg.Element.g();
					group.attributes['transform'] = new svg.Property('transform', this.attribute('gradientTransform').value);
					group.children = [ rect ];
					
					var tempSvg = new svg.Element.svg();
					tempSvg.attributes['x'] = new svg.Property('x', 0);
					tempSvg.attributes['y'] = new svg.Property('y', 0);
					tempSvg.attributes['width'] = new svg.Property('width', rootView.width);
					tempSvg.attributes['height'] = new svg.Property('height', rootView.height);
					tempSvg.children = [ group ];
					
					var c = document.createElement('canvas');
					c.width = rootView.width;
					c.height = rootView.height;
					var tempCtx = c.getContext('2d');
					tempCtx.fillStyle = g;
					tempSvg.render(tempCtx);		
					return tempCtx.createPattern(c, 'no-repeat');
				}
				
				return g;				
			}
		}
		svg.Element.GradientBase.prototype = new svg.Element.ElementBase;
		
		// linear gradient element
		svg.Element.linearGradient = function(node) {
			this.base = svg.Element.GradientBase;
			this.base(node);
			
			this.getGradient = function(ctx, element) {
				var bb = element.getBoundingBox();
				
				if (!this.attribute('x1').hasValue()
				 && !this.attribute('y1').hasValue()
				 && !this.attribute('x2').hasValue()
				 && !this.attribute('y2').hasValue()) {
					this.attribute('x1', true).value = 0;
					this.attribute('y1', true).value = 0;
					this.attribute('x2', true).value = 1;
					this.attribute('y2', true).value = 0;
				 }
				
				var x1 = (this.gradientUnits == 'objectBoundingBox' 
					? bb.x() + bb.width() * this.attribute('x1').numValue() 
					: this.attribute('x1').toPixels('x'));
				var y1 = (this.gradientUnits == 'objectBoundingBox' 
					? bb.y() + bb.height() * this.attribute('y1').numValue()
					: this.attribute('y1').toPixels('y'));
				var x2 = (this.gradientUnits == 'objectBoundingBox' 
					? bb.x() + bb.width() * this.attribute('x2').numValue()
					: this.attribute('x2').toPixels('x'));
				var y2 = (this.gradientUnits == 'objectBoundingBox' 
					? bb.y() + bb.height() * this.attribute('y2').numValue()
					: this.attribute('y2').toPixels('y'));

				if (x1 == x2 && y1 == y2) return null;
				return ctx.createLinearGradient(x1, y1, x2, y2);
			}
		}
		svg.Element.linearGradient.prototype = new svg.Element.GradientBase;
		
		// radial gradient element
		svg.Element.radialGradient = function(node) {
			this.base = svg.Element.GradientBase;
			this.base(node);
			
			this.getGradient = function(ctx, element) {
				var bb = element.getBoundingBox();
				
				if (!this.attribute('cx').hasValue()) this.attribute('cx', true).value = '50%';
				if (!this.attribute('cy').hasValue()) this.attribute('cy', true).value = '50%';
				if (!this.attribute('r').hasValue()) this.attribute('r', true).value = '50%';
				
				var cx = (this.gradientUnits == 'objectBoundingBox' 
					? bb.x() + bb.width() * this.attribute('cx').numValue() 
					: this.attribute('cx').toPixels('x'));
				var cy = (this.gradientUnits == 'objectBoundingBox' 
					? bb.y() + bb.height() * this.attribute('cy').numValue() 
					: this.attribute('cy').toPixels('y'));
				
				var fx = cx;
				var fy = cy;
				if (this.attribute('fx').hasValue()) {
					fx = (this.gradientUnits == 'objectBoundingBox' 
					? bb.x() + bb.width() * this.attribute('fx').numValue() 
					: this.attribute('fx').toPixels('x'));
				}
				if (this.attribute('fy').hasValue()) {
					fy = (this.gradientUnits == 'objectBoundingBox' 
					? bb.y() + bb.height() * this.attribute('fy').numValue() 
					: this.attribute('fy').toPixels('y'));
				}
				
				var r = (this.gradientUnits == 'objectBoundingBox' 
					? (bb.width() + bb.height()) / 2.0 * this.attribute('r').numValue()
					: this.attribute('r').toPixels());
				
				return ctx.createRadialGradient(fx, fy, 0, cx, cy, r);
			}
		}
		svg.Element.radialGradient.prototype = new svg.Element.GradientBase;
		
		// gradient stop element
		svg.Element.stop = function(node) {
			this.base = svg.Element.ElementBase;
			this.base(node);
			
			this.offset = this.attribute('offset').numValue();
			if (this.offset < 0) this.offset = 0;
			if (this.offset > 1) this.offset = 1;
			
			var stopColor = this.style('stop-color');
			if (this.style('stop-opacity').hasValue()) stopColor = stopColor.addOpacity(this.style('stop-opacity').value);
			this.color = stopColor.value;
		}
		svg.Element.stop.prototype = new svg.Element.ElementBase;
		
		// animation base element
		svg.Element.AnimateBase = function(node) {
			this.base = svg.Element.ElementBase;
			this.base(node);
			
			svg.Animations.push(this);
			
			this.duration = 0.0;
			this.begin = this.attribute('begin').toMilliseconds();
			this.maxDuration = this.begin + this.attribute('dur').toMilliseconds();
			
			this.getProperty = function() {
				var attributeType = this.attribute('attributeType').value;
				var attributeName = this.attribute('attributeName').value;
				
				if (attributeType == 'CSS') {
					return this.parent.style(attributeName, true);
				}
				return this.parent.attribute(attributeName, true);			
			};
			
			this.initialValue = null;
			this.initialUnits = '';
			this.removed = false;			

			this.calcValue = function() {
				// OVERRIDE ME!
				return '';
			}
					
			this.update = function(delta) {	
				// set initial value
				if (this.initialValue == null) {
					this.initialValue = this.getProperty().value;
					this.initialUnits = this.getProperty().getUnits();
				}
			
				// if we're past the end time
				if (this.duration > this.maxDuration) {
					// loop for indefinitely repeating animations
					if (this.attribute('repeatCount').value == 'indefinite'
					 || this.attribute('repeatDur').value == 'indefinite') {
						this.duration = 0.0
					}
					else if (this.attribute('fill').valueOrDefault('remove') == 'remove' && !this.removed) {
						this.removed = true;
						this.getProperty().value = this.initialValue;
						return true;
					}
					else {
						return false; // no updates made
					}
				}			
				this.duration = this.duration + delta;
			
				// if we're past the begin time
				var updated = false;
				if (this.begin < this.duration) {
					var newValue = this.calcValue(); // tween
					
					if (this.attribute('type').hasValue()) {
						// for transform, etc.
						var type = this.attribute('type').value;
						newValue = type + '(' + newValue + ')';
					}
					
					this.getProperty().value = newValue;
					updated = true;
				}
				
				return updated;
			}
			
			this.from = this.attribute('from');
			this.to = this.attribute('to');
			this.values = this.attribute('values');
			if (this.values.hasValue()) this.values.value = this.values.value.split(';');
			
			// fraction of duration we've covered
			this.progress = function() {
				var ret = { progress: (this.duration - this.begin) / (this.maxDuration - this.begin) };
				if (this.values.hasValue()) {
					var p = ret.progress * (this.values.value.length - 1);
					var lb = Math.floor(p), ub = Math.ceil(p);
					ret.from = new svg.Property('from', parseFloat(this.values.value[lb]));
					ret.to = new svg.Property('to', parseFloat(this.values.value[ub]));
					ret.progress = (p - lb) / (ub - lb);
				}
				else {
					ret.from = this.from;
					ret.to = this.to;
				}
				return ret;
			}			
		}
		svg.Element.AnimateBase.prototype = new svg.Element.ElementBase;
		
		// animate element
		svg.Element.animate = function(node) {
			this.base = svg.Element.AnimateBase;
			this.base(node);
			
			this.calcValue = function() {
				var p = this.progress();
				
				// tween value linearly
				var newValue = p.from.numValue() + (p.to.numValue() - p.from.numValue()) * p.progress; 
				return newValue + this.initialUnits;
			};
		}
		svg.Element.animate.prototype = new svg.Element.AnimateBase;
			
		// animate color element
		svg.Element.animateColor = function(node) {
			this.base = svg.Element.AnimateBase;
			this.base(node);

			this.calcValue = function() {
				var p = this.progress();
				var from = new RGBColor(p.from.value);
				var to = new RGBColor(p.to.value);
				
				if (from.ok && to.ok) {
					// tween color linearly
					var r = from.r + (to.r - from.r) * p.progress;
					var g = from.g + (to.g - from.g) * p.progress;
					var b = from.b + (to.b - from.b) * p.progress;
					return 'rgb('+parseInt(r,10)+','+parseInt(g,10)+','+parseInt(b,10)+')';
				}
				return this.attribute('from').value;
			};
		}
		svg.Element.animateColor.prototype = new svg.Element.AnimateBase;
		
		// animate transform element
		svg.Element.animateTransform = function(node) {
			this.base = svg.Element.AnimateBase;
			this.base(node);
			
			this.calcValue = function() {
				var p = this.progress();
				
				// tween value linearly
				var from = svg.ToNumberArray(p.from.value);
				var to = svg.ToNumberArray(p.to.value);
				var newValue = '';
				for (var i=0; i<from.length; i++) {
					newValue += from[i] + (to[i] - from[i]) * p.progress + ' ';
				}
				return newValue;
			};
		}
		svg.Element.animateTransform.prototype = new svg.Element.animate;
		
		// font element
		svg.Element.font = function(node) {
			this.base = svg.Element.ElementBase;
			this.base(node);

			this.horizAdvX = this.attribute('horiz-adv-x').numValue();			
			
			this.isRTL = false;
			this.isArabic = false;
			this.fontFace = null;
			this.missingGlyph = null;
			this.glyphs = [];			
			for (var i=0; i<this.children.length; i++) {
				var child = this.children[i];
				if (child.type == 'font-face') {
					this.fontFace = child;
					if (child.style('font-family').hasValue()) {
						svg.Definitions[child.style('font-family').value] = this;
					}
				}
				else if (child.type == 'missing-glyph') this.missingGlyph = child;
				else if (child.type == 'glyph') {
					if (child.arabicForm != '') {
						this.isRTL = true;
						this.isArabic = true;
						if (typeof(this.glyphs[child.unicode]) == 'undefined') this.glyphs[child.unicode] = [];
						this.glyphs[child.unicode][child.arabicForm] = child;
					}
					else {
						this.glyphs[child.unicode] = child;
					}
				}
			}	
		}
		svg.Element.font.prototype = new svg.Element.ElementBase;
		
		// font-face element
		svg.Element.fontface = function(node) {
			this.base = svg.Element.ElementBase;
			this.base(node);	
			
			this.ascent = this.attribute('ascent').value;
			this.descent = this.attribute('descent').value;
			this.unitsPerEm = this.attribute('units-per-em').numValue();				
		}
		svg.Element.fontface.prototype = new svg.Element.ElementBase;
		
		// missing-glyph element
		svg.Element.missingglyph = function(node) {
			this.base = svg.Element.path;
			this.base(node);	
			
			this.horizAdvX = 0;
		}
		svg.Element.missingglyph.prototype = new svg.Element.path;
		
		// glyph element
		svg.Element.glyph = function(node) {
			this.base = svg.Element.path;
			this.base(node);	
			
			this.horizAdvX = this.attribute('horiz-adv-x').numValue();
			this.unicode = this.attribute('unicode').value;
			this.arabicForm = this.attribute('arabic-form').value;
		}
		svg.Element.glyph.prototype = new svg.Element.path;
		
		// text element
		svg.Element.text = function(node) {
			this.captureTextNodes = true;
			this.base = svg.Element.RenderedElementBase;
			this.base(node);
			
			this.baseSetContext = this.setContext;
			this.setContext = function(ctx) {
				this.baseSetContext(ctx);
				if (this.style('dominant-baseline').hasValue()) ctx.textBaseline = this.style('dominant-baseline').value;
				if (this.style('alignment-baseline').hasValue()) ctx.textBaseline = this.style('alignment-baseline').value;
			}
			
			this.getBoundingBox = function () {
				// TODO: implement
				return new svg.BoundingBox(this.attribute('x').toPixels('x'), this.attribute('y').toPixels('y'), 0, 0);
			}
			
			this.renderChildren = function(ctx) {
				this.x = this.attribute('x').toPixels('x');
				this.y = this.attribute('y').toPixels('y');
				this.x += this.getAnchorDelta(ctx, this, 0);
				for (var i=0; i<this.children.length; i++) {
					this.renderChild(ctx, this, i);
				}
			}
			
			this.getAnchorDelta = function (ctx, parent, startI) {
				var textAnchor = this.style('text-anchor').valueOrDefault('start');
				if (textAnchor != 'start') {
					var width = 0;
					for (var i=startI; i<parent.children.length; i++) {
						var child = parent.children[i];
						if (i > startI && child.attribute('x').hasValue()) break; // new group
						width += child.measureTextRecursive(ctx);
					}
					return -1 * (textAnchor == 'end' ? width : width / 2.0);
				}
				return 0;
			}
			
			this.renderChild = function(ctx, parent, i) {
				var child = parent.children[i];
				if (child.attribute('x').hasValue()) {
					child.x = child.attribute('x').toPixels('x') + this.getAnchorDelta(ctx, parent, i);
				}
				else {
					if (this.attribute('dx').hasValue()) this.x += this.attribute('dx').toPixels('x');
					if (child.attribute('dx').hasValue()) this.x += child.attribute('dx').toPixels('x');
					child.x = this.x;
				}
				this.x = child.x + child.measureText(ctx);
				
				if (child.attribute('y').hasValue()) {
					child.y = child.attribute('y').toPixels('y');
				}
				else {
					if (this.attribute('dy').hasValue()) this.y += this.attribute('dy').toPixels('y');
					if (child.attribute('dy').hasValue()) this.y += child.attribute('dy').toPixels('y');
					child.y = this.y;
				}
				this.y = child.y;
				
				child.render(ctx);
				
				for (var i=0; i<child.children.length; i++) {
					this.renderChild(ctx, child, i);
				}
			}
		}
		svg.Element.text.prototype = new svg.Element.RenderedElementBase;
		
		// text base
		svg.Element.TextElementBase = function(node) {
			this.base = svg.Element.RenderedElementBase;
			this.base(node);
			
			this.getGlyph = function(font, text, i) {
				var c = text[i];
				var glyph = null;
				if (font.isArabic) {
					var arabicForm = 'isolated';
					if ((i==0 || text[i-1]==' ') && i<text.length-2 && text[i+1]!=' ') arabicForm = 'terminal'; 
					if (i>0 && text[i-1]!=' ' && i<text.length-2 && text[i+1]!=' ') arabicForm = 'medial';
					if (i>0 && text[i-1]!=' ' && (i == text.length-1 || text[i+1]==' ')) arabicForm = 'initial';
					if (typeof(font.glyphs[c]) != 'undefined') {
						glyph = font.glyphs[c][arabicForm];
						if (glyph == null && font.glyphs[c].type == 'glyph') glyph = font.glyphs[c];
					}
				}
				else {
					glyph = font.glyphs[c];
				}
				if (glyph == null) glyph = font.missingGlyph;
				return glyph;
			}
			
			this.renderChildren = function(ctx) {
				var customFont = this.parent.style('font-family').getDefinition();
				if (customFont != null) {
					var fontSize = this.parent.style('font-size').numValueOrDefault(svg.Font.Parse(svg.ctx.font).fontSize);
					var fontStyle = this.parent.style('font-style').valueOrDefault(svg.Font.Parse(svg.ctx.font).fontStyle);
					var text = this.getText();
					if (customFont.isRTL) text = text.split("").reverse().join("");
					
					var dx = svg.ToNumberArray(this.parent.attribute('dx').value);
					for (var i=0; i<text.length; i++) {
						var glyph = this.getGlyph(customFont, text, i);
						var scale = fontSize / customFont.fontFace.unitsPerEm;
						ctx.translate(this.x, this.y);
						ctx.scale(scale, -scale);
						var lw = ctx.lineWidth;
						ctx.lineWidth = ctx.lineWidth * customFont.fontFace.unitsPerEm / fontSize;
						if (fontStyle == 'italic') ctx.transform(1, 0, .4, 1, 0, 0);
						glyph.render(ctx);
						if (fontStyle == 'italic') ctx.transform(1, 0, -.4, 1, 0, 0);
						ctx.lineWidth = lw;
						ctx.scale(1/scale, -1/scale);
						ctx.translate(-this.x, -this.y);	
						
						this.x += fontSize * (glyph.horizAdvX || customFont.horizAdvX) / customFont.fontFace.unitsPerEm;
						if (typeof(dx[i]) != 'undefined' && !isNaN(dx[i])) {
							this.x += dx[i];
						}
					}
					return;
				}
			
				if (ctx.fillStyle != '') ctx.fillText(svg.compressSpaces(this.getText()), this.x, this.y);
				if (ctx.strokeStyle != '') ctx.strokeText(svg.compressSpaces(this.getText()), this.x, this.y);
			}
			
			this.getText = function() {
				// OVERRIDE ME
			}
			
			this.measureTextRecursive = function(ctx) {
				var width = this.measureText(ctx);
				for (var i=0; i<this.children.length; i++) {
					width += this.children[i].measureTextRecursive(ctx);
				}
				return width;
			}
			
			this.measureText = function(ctx) {
				var customFont = this.parent.style('font-family').getDefinition();
				if (customFont != null) {
					var fontSize = this.parent.style('font-size').numValueOrDefault(svg.Font.Parse(svg.ctx.font).fontSize);
					var measure = 0;
					var text = this.getText();
					if (customFont.isRTL) text = text.split("").reverse().join("");
					var dx = svg.ToNumberArray(this.parent.attribute('dx').value);
					for (var i=0; i<text.length; i++) {
						var glyph = this.getGlyph(customFont, text, i);
						measure += (glyph.horizAdvX || customFont.horizAdvX) * fontSize / customFont.fontFace.unitsPerEm;
						if (typeof(dx[i]) != 'undefined' && !isNaN(dx[i])) {
							measure += dx[i];
						}
					}
					return measure;
				}
			
				var textToMeasure = svg.compressSpaces(this.getText());
				if (!ctx.measureText) return textToMeasure.length * 10;
				
				ctx.save();
				this.setContext(ctx);
				var width = ctx.measureText(textToMeasure).width;
				ctx.restore();
				return width;
			}
		}
		svg.Element.TextElementBase.prototype = new svg.Element.RenderedElementBase;
		
		// tspan 
		svg.Element.tspan = function(node) {
			this.captureTextNodes = true;
			this.base = svg.Element.TextElementBase;
			this.base(node);
			
			this.text = node.nodeValue || node.text || '';
			this.getText = function() {
				return this.text;
			}
		}
		svg.Element.tspan.prototype = new svg.Element.TextElementBase;
		
		// tref
		svg.Element.tref = function(node) {
			this.base = svg.Element.TextElementBase;
			this.base(node);
			
			this.getText = function() {
				var element = this.getHrefAttribute().getDefinition();
				if (element != null) return element.children[0].getText();
			}
		}
		svg.Element.tref.prototype = new svg.Element.TextElementBase;		
		
		// a element
		svg.Element.a = function(node) {
			this.base = svg.Element.TextElementBase;
			this.base(node);
			
			this.hasText = true;
			for (var i=0; i<node.childNodes.length; i++) {
				if (node.childNodes[i].nodeType != 3) this.hasText = false;
			}
			
			// this might contain text
			this.text = this.hasText ? node.childNodes[0].nodeValue : '';
			this.getText = function() {
				return this.text;
			}		

			this.baseRenderChildren = this.renderChildren;
			this.renderChildren = function(ctx) {
				if (this.hasText) {
					// render as text element
					this.baseRenderChildren(ctx);
					var fontSize = new svg.Property('fontSize', svg.Font.Parse(svg.ctx.font).fontSize);
					svg.Mouse.checkBoundingBox(this, new svg.BoundingBox(this.x, this.y - fontSize.toPixels('y'), this.x + this.measureText(ctx), this.y));					
				}
				else {
					// render as temporary group
					var g = new svg.Element.g();
					g.children = this.children;
					g.parent = this;
					g.render(ctx);
				}
			}
			
			this.onclick = function() {
				window.open(this.getHrefAttribute().value);
			}
			
			this.onmousemove = function() {
				svg.ctx.canvas.style.cursor = 'pointer';
			}
		}
		svg.Element.a.prototype = new svg.Element.TextElementBase;		
		
		// image element
		svg.Element.image = function(node) {
			this.base = svg.Element.RenderedElementBase;
			this.base(node);
			
			var href = this.getHrefAttribute().value;
			var isSvg = href.match(/\.svg$/)
			
			svg.Images.push(this);
			this.loaded = false;
			if (!isSvg) {
				this.img = document.createElement('img');
				var self = this;
				this.img.onload = function() { self.loaded = true; }
				this.img.onerror = function() { if (typeof(console) != 'undefined') { console.log('ERROR: image "' + href + '" not found'); self.loaded = true; } }
				this.img.src = href;
			}
			else {
				this.img = svg.ajax(href);
				this.loaded = true;
			}
			
			this.renderChildren = function(ctx) {
				var x = this.attribute('x').toPixels('x');
				var y = this.attribute('y').toPixels('y');
				
				var width = this.attribute('width').toPixels('x');
				var height = this.attribute('height').toPixels('y');			
				if (width == 0 || height == 0) return;
			
				ctx.save();
				if (isSvg) {
					ctx.drawSvg(this.img, x, y, width, height);
				}
				else {
					ctx.translate(x, y);
					svg.AspectRatio(ctx,
									this.attribute('preserveAspectRatio').value,
									width,
									this.img.width,
									height,
									this.img.height,
									0,
									0);	
					ctx.drawImage(this.img, 0, 0);		
				}
				ctx.restore();
			}
			
			this.getBoundingBox = function() {
				var x = this.attribute('x').toPixels('x');
				var y = this.attribute('y').toPixels('y');
				var width = this.attribute('width').toPixels('x');
				var height = this.attribute('height').toPixels('y');
				return new svg.BoundingBox(x, y, x + width, y + height);
			}
		}
		svg.Element.image.prototype = new svg.Element.RenderedElementBase;
		
		// group element
		svg.Element.g = function(node) {
			this.base = svg.Element.RenderedElementBase;
			this.base(node);
			
			this.getBoundingBox = function() {
				var bb = new svg.BoundingBox();
				for (var i=0; i<this.children.length; i++) {
					bb.addBoundingBox(this.children[i].getBoundingBox());
				}
				return bb;
			};
		}
		svg.Element.g.prototype = new svg.Element.RenderedElementBase;

		// symbol element
		svg.Element.symbol = function(node) {
			this.base = svg.Element.RenderedElementBase;
			this.base(node);
			
			this.baseSetContext = this.setContext;
			this.setContext = function(ctx) {		
				this.baseSetContext(ctx);
				
				// viewbox
				if (this.attribute('viewBox').hasValue()) {				
					var viewBox = svg.ToNumberArray(this.attribute('viewBox').value);
					var minX = viewBox[0];
					var minY = viewBox[1];
					width = viewBox[2];
					height = viewBox[3];
					
					svg.AspectRatio(ctx,
									this.attribute('preserveAspectRatio').value, 
									this.attribute('width').toPixels('x'),
									width,
									this.attribute('height').toPixels('y'),
									height,
									minX,
									minY);

					svg.ViewPort.SetCurrent(viewBox[2], viewBox[3]);						
				}
			}			
		}
		svg.Element.symbol.prototype = new svg.Element.RenderedElementBase;		
			
		// style element
		svg.Element.style = function(node) { 
			this.base = svg.Element.ElementBase;
			this.base(node);
			
			// text, or spaces then CDATA
			var css = ''
			for (var i=0; i<node.childNodes.length; i++) {
			  css += node.childNodes[i].nodeValue;
			}
			css = css.replace(/(\/\*([^*]|[\r\n]|(\*+([^*\/]|[\r\n])))*\*+\/)|(^[\s]*\/\/.*)/gm, ''); // remove comments
			css = svg.compressSpaces(css); // replace whitespace
			var cssDefs = css.split('}');
			for (var i=0; i<cssDefs.length; i++) {
				if (svg.trim(cssDefs[i]) != '') {
					var cssDef = cssDefs[i].split('{');
					var cssClasses = cssDef[0].split(',');
					var cssProps = cssDef[1].split(';');
					for (var j=0; j<cssClasses.length; j++) {
						var cssClass = svg.trim(cssClasses[j]);
						if (cssClass != '') {
							var props = {};
							for (var k=0; k<cssProps.length; k++) {
								var prop = cssProps[k].indexOf(':');
								var name = cssProps[k].substr(0, prop);
								var value = cssProps[k].substr(prop + 1, cssProps[k].length - prop);
								if (name != null && value != null) {
									props[svg.trim(name)] = new svg.Property(svg.trim(name), svg.trim(value));
								}
							}
							svg.Styles[cssClass] = props;
							if (cssClass == '@font-face') {
								var fontFamily = props['font-family'].value.replace(/"/g,'');
								var srcs = props['src'].value.split(',');
								for (var s=0; s<srcs.length; s++) {
									if (srcs[s].indexOf('format("svg")') > 0) {
										var urlStart = srcs[s].indexOf('url');
										var urlEnd = srcs[s].indexOf(')', urlStart);
										var url = srcs[s].substr(urlStart + 5, urlEnd - urlStart - 6);
										var doc = svg.parseXml(svg.ajax(url));
										var fonts = doc.getElementsByTagName('font');
										for (var f=0; f<fonts.length; f++) {
											var font = svg.CreateElement(fonts[f]);
											svg.Definitions[fontFamily] = font;
										}
									}
								}
							}
						}
					}
				}
			}
		}
		svg.Element.style.prototype = new svg.Element.ElementBase;
		
		// use element 
		svg.Element.use = function(node) {
			this.base = svg.Element.RenderedElementBase;
			this.base(node);
			
			this.baseSetContext = this.setContext;
			this.setContext = function(ctx) {
				this.baseSetContext(ctx);
				if (this.attribute('x').hasValue()) ctx.translate(this.attribute('x').toPixels('x'), 0);
				if (this.attribute('y').hasValue()) ctx.translate(0, this.attribute('y').toPixels('y'));
			}
			
			this.getDefinition = function() {
				var element = this.getHrefAttribute().getDefinition();
				if (this.attribute('width').hasValue()) element.attribute('width', true).value = this.attribute('width').value;
				if (this.attribute('height').hasValue()) element.attribute('height', true).value = this.attribute('height').value;
				return element;
			}
			
			this.path = function(ctx) {
				var element = this.getDefinition();
				if (element != null) element.path(ctx);
			}
			
			this.getBoundingBox = function() {
				var element = this.getDefinition();
				if (element != null) return element.getBoundingBox();
			}
			
			this.renderChildren = function(ctx) {
				var element = this.getDefinition();
				if (element != null) {
					// temporarily detach from parent and render
					var oldParent = element.parent;
					element.parent = null;
					element.render(ctx);
					element.parent = oldParent;
				}
			}
		}
		svg.Element.use.prototype = new svg.Element.RenderedElementBase;
		
		// mask element
		svg.Element.mask = function(node) {
			this.base = svg.Element.ElementBase;
			this.base(node);
						
			this.apply = function(ctx, element) {
				// render as temp svg	
				var x = this.attribute('x').toPixels('x');
				var y = this.attribute('y').toPixels('y');
				var width = this.attribute('width').toPixels('x');
				var height = this.attribute('height').toPixels('y');
				
				if (width == 0 && height == 0) {
					var bb = new svg.BoundingBox();
					for (var i=0; i<this.children.length; i++) {
						bb.addBoundingBox(this.children[i].getBoundingBox());
					}
					var x = Math.floor(bb.x1);
					var y = Math.floor(bb.y1);
					var width = Math.floor(bb.width());
					var	height = Math.floor(bb.height());
				}
				
				// temporarily remove mask to avoid recursion
				var mask = element.attribute('mask').value;
				element.attribute('mask').value = '';
				
					var cMask = document.createElement('canvas');
					cMask.width = x + width;
					cMask.height = y + height;
					var maskCtx = cMask.getContext('2d');
					this.renderChildren(maskCtx);
				
					var c = document.createElement('canvas');
					c.width = x + width;
					c.height = y + height;
					var tempCtx = c.getContext('2d');
					element.render(tempCtx);
					tempCtx.globalCompositeOperation = 'destination-in';
					tempCtx.fillStyle = maskCtx.createPattern(cMask, 'no-repeat');
					tempCtx.fillRect(0, 0, x + width, y + height);
					
					ctx.fillStyle = tempCtx.createPattern(c, 'no-repeat');
					ctx.fillRect(0, 0, x + width, y + height);
					
				// reassign mask
				element.attribute('mask').value = mask;	
			}
			
			this.render = function(ctx) {
				// NO RENDER
			}
		}
		svg.Element.mask.prototype = new svg.Element.ElementBase;
		
		// clip element
		svg.Element.clipPath = function(node) {
			this.base = svg.Element.ElementBase;
			this.base(node);
			
			this.apply = function(ctx) {
				for (var i=0; i<this.children.length; i++) {
					var child = this.children[i];
					if (typeof(child.path) != 'undefined') {
						var transform = null;
						if (child.attribute('transform').hasValue()) { 
							transform = new svg.Transform(child.attribute('transform').value);
							transform.apply(ctx);
						}
						child.path(ctx);
						ctx.clip();
						if (transform) { transform.unapply(ctx); }
					}
				}
			}
			
			this.render = function(ctx) {
				// NO RENDER
			}
		}
		svg.Element.clipPath.prototype = new svg.Element.ElementBase;

		// filters
		svg.Element.filter = function(node) {
			this.base = svg.Element.ElementBase;
			this.base(node);
						
			this.apply = function(ctx, element) {
				// render as temp svg	
				var bb = element.getBoundingBox();
				var x = Math.floor(bb.x1);
				var y = Math.floor(bb.y1);
				var width = Math.floor(bb.width());
				var	height = Math.floor(bb.height());

				// temporarily remove filter to avoid recursion
				var filter = element.style('filter').value;
				element.style('filter').value = '';
				
				var px = 0, py = 0;
				for (var i=0; i<this.children.length; i++) {
					var efd = this.children[i].extraFilterDistance || 0;
					px = Math.max(px, efd);
					py = Math.max(py, efd);
				}
				
				var c = document.createElement('canvas');
				c.width = width + 2*px;
				c.height = height + 2*py;
				var tempCtx = c.getContext('2d');
				tempCtx.translate(-x + px, -y + py);
				element.render(tempCtx);
			
				// apply filters
				for (var i=0; i<this.children.length; i++) {
					this.children[i].apply(tempCtx, 0, 0, width + 2*px, height + 2*py);
				}
				
				// render on me
				ctx.drawImage(c, 0, 0, width + 2*px, height + 2*py, x - px, y - py, width + 2*px, height + 2*py);
				
				// reassign filter
				element.style('filter', true).value = filter;	
			}
			
			this.render = function(ctx) {
				// NO RENDER
			}		
		}
		svg.Element.filter.prototype = new svg.Element.ElementBase;
		
		svg.Element.feMorphology = function(node) {
			this.base = svg.Element.ElementBase;
			this.base(node);
			
			this.apply = function(ctx, x, y, width, height) {
				// TODO: implement
			}
		}
		svg.Element.feMorphology.prototype = new svg.Element.ElementBase;
		
		svg.Element.feColorMatrix = function(node) {
			this.base = svg.Element.ElementBase;
			this.base(node);
			
			function imGet(img, x, y, width, height, rgba) {
				return img[y*width*4 + x*4 + rgba];
			}
			
			function imSet(img, x, y, width, height, rgba, val) {
				img[y*width*4 + x*4 + rgba] = val;
			}
			
			this.apply = function(ctx, x, y, width, height) {
				// only supporting grayscale for now per Issue 195, need to extend to all matrix
				// assuming x==0 && y==0 for now
				var srcData = ctx.getImageData(0, 0, width, height);
				for (var y = 0; y < height; y++) {
					for (var x = 0; x < width; x++) {
						var r = imGet(srcData.data, x, y, width, height, 0);
						var g = imGet(srcData.data, x, y, width, height, 1);
						var b = imGet(srcData.data, x, y, width, height, 2);
						var gray = (r + g + b) / 3;
						imSet(srcData.data, x, y, width, height, 0, gray);
						imSet(srcData.data, x, y, width, height, 1, gray);
						imSet(srcData.data, x, y, width, height, 2, gray);
					}
				}
				ctx.clearRect(0, 0, width, height);
				ctx.putImageData(srcData, 0, 0);
			}
		}
		svg.Element.feColorMatrix.prototype = new svg.Element.ElementBase;
		
		svg.Element.feGaussianBlur = function(node) {
			this.base = svg.Element.ElementBase;
			this.base(node);

			this.blurRadius = Math.floor(this.attribute('stdDeviation').numValue());
			this.extraFilterDistance = this.blurRadius;
			
			this.apply = function(ctx, x, y, width, height) {
				if (typeof(stackBlurCanvasRGBA) == 'undefined') {
					if (typeof(console) != 'undefined') { console.log('ERROR: StackBlur.js must be included for blur to work'); }
					return;
				}
				
				// StackBlur requires canvas be on document
				ctx.canvas.id = svg.UniqueId();
				ctx.canvas.style.display = 'none';
				document.body.appendChild(ctx.canvas);
				stackBlurCanvasRGBA(ctx.canvas.id, x, y, width, height, this.blurRadius);
				document.body.removeChild(ctx.canvas);
			}
		}
		svg.Element.feGaussianBlur.prototype = new svg.Element.ElementBase;
		
		// title element, do nothing
		svg.Element.title = function(node) {
		}
		svg.Element.title.prototype = new svg.Element.ElementBase;

		// desc element, do nothing
		svg.Element.desc = function(node) {
		}
		svg.Element.desc.prototype = new svg.Element.ElementBase;		
		
		svg.Element.MISSING = function(node) {
			if (typeof(console) != 'undefined') { console.log('ERROR: Element \'' + node.nodeName + '\' not yet implemented.'); }
		}
		svg.Element.MISSING.prototype = new svg.Element.ElementBase;
		
		// element factory
		svg.CreateElement = function(node) {	
			var className = node.nodeName.replace(/^[^:]+:/,''); // remove namespace
			className = className.replace(/\-/g,''); // remove dashes
			var e = null;
			if (typeof(svg.Element[className]) != 'undefined') {
				e = new svg.Element[className](node);
			}
			else {
				e = new svg.Element.MISSING(node);
			}

			e.type = node.nodeName;
			return e;
		}
				
		// load from url
		svg.load = function(ctx, url) {
			svg.loadXml(ctx, svg.ajax(url));
		}
		
		// load from xml
		svg.loadXml = function(ctx, xml) {
			svg.loadXmlDoc(ctx, svg.parseXml(xml));
		}
		
		svg.loadXmlDoc = function(ctx, dom) {
			svg.init(ctx);
			
			var mapXY = function(p) {
				var e = ctx.canvas;
				while (e) {
					p.x -= e.offsetLeft;
					p.y -= e.offsetTop;
					e = e.offsetParent;
				}
				if (window.scrollX) p.x += window.scrollX;
				if (window.scrollY) p.y += window.scrollY;
				return p;
			}
			
			// bind mouse
			if (svg.opts['ignoreMouse'] != true) {
				ctx.canvas.onclick = function(e) {
					var p = mapXY(new svg.Point(e != null ? e.clientX : event.clientX, e != null ? e.clientY : event.clientY));
					svg.Mouse.onclick(p.x, p.y);
				};
				ctx.canvas.onmousemove = function(e) {
					var p = mapXY(new svg.Point(e != null ? e.clientX : event.clientX, e != null ? e.clientY : event.clientY));
					svg.Mouse.onmousemove(p.x, p.y);
				};
			}
		
			var e = svg.CreateElement(dom.documentElement);
			e.root = true;
					
			// render loop
			var isFirstRender = true;
			var draw = function() {
				svg.ViewPort.Clear();
				if (ctx.canvas.parentNode) svg.ViewPort.SetCurrent(ctx.canvas.parentNode.clientWidth, ctx.canvas.parentNode.clientHeight);
			
				if (svg.opts['ignoreDimensions'] != true) {
					// set canvas size
					if (e.style('width').hasValue()) {
						ctx.canvas.width = e.style('width').toPixels('x');
						ctx.canvas.style.width = ctx.canvas.width + 'px';
					}
					if (e.style('height').hasValue()) {
						ctx.canvas.height = e.style('height').toPixels('y');
						ctx.canvas.style.height = ctx.canvas.height + 'px';
					}
				}
				var cWidth = ctx.canvas.clientWidth || ctx.canvas.width;
				var cHeight = ctx.canvas.clientHeight || ctx.canvas.height;
				if (svg.opts['ignoreDimensions'] == true && e.style('width').hasValue() && e.style('height').hasValue()) {
					cWidth = e.style('width').toPixels('x');
					cHeight = e.style('height').toPixels('y');
				}
				svg.ViewPort.SetCurrent(cWidth, cHeight);		
				
				if (svg.opts['offsetX'] != null) e.attribute('x', true).value = svg.opts['offsetX'];
				if (svg.opts['offsetY'] != null) e.attribute('y', true).value = svg.opts['offsetY'];
				if (svg.opts['scaleWidth'] != null && svg.opts['scaleHeight'] != null) {
					var xRatio = 1, yRatio = 1, viewBox = svg.ToNumberArray(e.attribute('viewBox').value);
					if (e.attribute('width').hasValue()) xRatio = e.attribute('width').toPixels('x') / svg.opts['scaleWidth'];
					else if (!isNaN(viewBox[2])) xRatio = viewBox[2] / svg.opts['scaleWidth'];
					if (e.attribute('height').hasValue()) yRatio = e.attribute('height').toPixels('y') / svg.opts['scaleHeight'];
					else if (!isNaN(viewBox[3])) yRatio = viewBox[3] / svg.opts['scaleHeight'];
					
					e.attribute('width', true).value = svg.opts['scaleWidth'];
					e.attribute('height', true).value = svg.opts['scaleHeight'];			
					e.attribute('viewBox', true).value = '0 0 ' + (cWidth * xRatio) + ' ' + (cHeight * yRatio);
					e.attribute('preserveAspectRatio', true).value = 'none';
				}
			
				// clear and render
				if (svg.opts['ignoreClear'] != true) {
					ctx.clearRect(0, 0, cWidth, cHeight);
				}
				e.render(ctx);
				if (isFirstRender) {
					isFirstRender = false;
					if (typeof(svg.opts['renderCallback']) == 'function') svg.opts['renderCallback'](dom);
				}			
			}
			
			var waitingForImages = true;
			if (svg.ImagesLoaded()) {
				waitingForImages = false;
				draw();
			}
			svg.intervalID = setInterval(function() { 
				var needUpdate = false;
				
				if (waitingForImages && svg.ImagesLoaded()) {
					waitingForImages = false;
					needUpdate = true;
				}
			
				// need update from mouse events?
				if (svg.opts['ignoreMouse'] != true) {
					needUpdate = needUpdate | svg.Mouse.hasEvents();
				}
			
				// need update from animations?
				if (svg.opts['ignoreAnimation'] != true) {
					for (var i=0; i<svg.Animations.length; i++) {
						needUpdate = needUpdate | svg.Animations[i].update(1000 / svg.FRAMERATE);
					}
				}
				
				// need update from redraw?
				if (typeof(svg.opts['forceRedraw']) == 'function') {
					if (svg.opts['forceRedraw']() == true) needUpdate = true;
				}
				
				// render if needed
				if (needUpdate) {
					draw();				
					svg.Mouse.runEvents(); // run and clear our events
				}
			}, 1000 / svg.FRAMERATE);
		}
		
		svg.stop = function() {
			if (svg.intervalID) {
				clearInterval(svg.intervalID);
			}
		}
		
		svg.Mouse = new (function() {
			this.events = [];
			this.hasEvents = function() { return this.events.length != 0; }
		
			this.onclick = function(x, y) {
				this.events.push({ type: 'onclick', x: x, y: y, 
					run: function(e) { if (e.onclick) e.onclick(); }
				});
			}
			
			this.onmousemove = function(x, y) {
				this.events.push({ type: 'onmousemove', x: x, y: y,
					run: function(e) { if (e.onmousemove) e.onmousemove(); }
				});
			}			
			
			this.eventElements = [];
			
			this.checkPath = function(element, ctx) {
				for (var i=0; i<this.events.length; i++) {
					var e = this.events[i];
					if (ctx.isPointInPath && ctx.isPointInPath(e.x, e.y)) this.eventElements[i] = element;
				}
			}
			
			this.checkBoundingBox = function(element, bb) {
				for (var i=0; i<this.events.length; i++) {
					var e = this.events[i];
					if (bb.isPointInBox(e.x, e.y)) this.eventElements[i] = element;
				}			
			}
			
			this.runEvents = function() {
				svg.ctx.canvas.style.cursor = '';
				
				for (var i=0; i<this.events.length; i++) {
					var e = this.events[i];
					var element = this.eventElements[i];
					while (element) {
						e.run(element);
						element = element.parent;
					}
				}		
			
				// done running, clear
				this.events = []; 
				this.eventElements = [];
			}
		});
		
		return svg;
	}
Returns a new undirected graph using the nodes and edges from this graph.
The new graph will have the same nodes, but the edges will be made
undirected. Edge ids are preserved in this transformation.