function removeFormat(format, vars, node, compare_node) {
			var i, attrs, stylesModified;

			// Check if node matches format
			if (!matchName(node, format) && !isColorFormatAndAnchor(node, format)) {
				return FALSE;
			}

			// Should we compare with format attribs and styles
			if (format.remove != 'all') {
				// Remove styles
				each(format.styles, function(value, name) {
					value = normalizeStyleValue(replaceVars(value, vars), name);

					// Indexed array
					if (typeof name === 'number') {
						name = value;
						compare_node = 0;
					}

					if (format.remove_similar || (!compare_node || isEq(getStyle(compare_node, name), value))) {
						dom.setStyle(node, name, '');
					}

					stylesModified = 1;
				});

				// Remove style attribute if it's empty
				if (stylesModified && dom.getAttrib(node, 'style') === '') {
					node.removeAttribute('style');
					node.removeAttribute('data-mce-style');
				}

				// Remove attributes
				each(format.attributes, function(value, name) {
					var valueOut;

					value = replaceVars(value, vars);

					// Indexed array
					if (typeof name === 'number') {
						name = value;
						compare_node = 0;
					}

					if (!compare_node || isEq(dom.getAttrib(compare_node, name), value)) {
						// Keep internal classes
						if (name == 'class') {
							value = dom.getAttrib(node, name);
							if (value) {
								// Build new class value where everything is removed except the internal prefixed classes
								valueOut = '';
								each(value.split(/\s+/), function(cls) {
									if (/mce\-\w+/.test(cls)) {
										valueOut += (valueOut ? ' ' : '') + cls;
									}
								});

								// We got some internal classes left
								if (valueOut) {
									dom.setAttrib(node, name, valueOut);
									return;
								}
							}
						}

						// IE6 has a bug where the attribute doesn't get removed correctly
						if (name == "class") {
							node.removeAttribute('className');
						}

						// Remove mce prefixed attributes
						if (MCE_ATTR_RE.test(name)) {
							node.removeAttribute('data-mce-' + name);
						}

						node.removeAttribute(name);
					}
				});

				// Remove classes
				each(format.classes, function(value) {
					value = replaceVars(value, vars);

					if (!compare_node || dom.hasClass(compare_node, value)) {
						dom.removeClass(node, value);
					}
				});

				// Check for non internal attributes
				attrs = dom.getAttribs(node);
				for (i = 0; i < attrs.length; i++) {
					if (attrs[i].nodeName.indexOf('_') !== 0) {
						return FALSE;
					}
				}
			}

			// Remove the inline child if it's empty for example <b> or <span>
			if (format.remove != 'none') {
				removeNode(node, format);
				return TRUE;
			}
		}
Removes the specified format for the specified node. It will also remove the node if it doesn't have
any attributes if the format specifies it to do so.

@private
@param {Object} format Format object with items to remove from node.
@param {Object} vars Name/value object with variables to apply to format.
@param {Node} node Node to remove the format styles on.
@param {Node} compare_node Optional compare node, if specified the styles will be compared to that node.
@return {Boolean} True/false if the node was removed or not.