function _fnScrollDraw ( settings )
	{
		// Given that this is such a monster function, a lot of variables are use
		// to try and keep the minimised size as small as possible
		var
			scroll         = settings.oScroll,
			scrollX        = scroll.sX,
			scrollXInner   = scroll.sXInner,
			scrollY        = scroll.sY,
			barWidth       = scroll.iBarWidth,
			divHeader      = $(settings.nScrollHead),
			divHeaderStyle = divHeader[0].style,
			divHeaderInner = divHeader.children('div'),
			divHeaderInnerStyle = divHeaderInner[0].style,
			divHeaderTable = divHeaderInner.children('table'),
			divBodyEl      = settings.nScrollBody,
			divBody        = $(divBodyEl),
			divBodyStyle   = divBodyEl.style,
			divFooter      = $(settings.nScrollFoot),
			divFooterInner = divFooter.children('div'),
			divFooterTable = divFooterInner.children('table'),
			header         = $(settings.nTHead),
			table          = $(settings.nTable),
			tableEl        = table[0],
			tableStyle     = tableEl.style,
			footer         = settings.nTFoot ? $(settings.nTFoot) : null,
			browser        = settings.oBrowser,
			ie67           = browser.bScrollOversize,
			dtHeaderCells  = _pluck( settings.aoColumns, 'nTh' ),
			headerTrgEls, footerTrgEls,
			headerSrcEls, footerSrcEls,
			headerCopy, footerCopy,
			headerWidths=[], footerWidths=[],
			headerContent=[], footerContent=[],
			idx, correction, sanityWidth,
			zeroOut = function(nSizer) {
				var style = nSizer.style;
				style.paddingTop = "0";
				style.paddingBottom = "0";
				style.borderTopWidth = "0";
				style.borderBottomWidth = "0";
				style.height = 0;
			};
	
		// If the scrollbar visibility has changed from the last draw, we need to
		// adjust the column sizes as the table width will have changed to account
		// for the scrollbar
		var scrollBarVis = divBodyEl.scrollHeight > divBodyEl.clientHeight;
		
		if ( settings.scrollBarVis !== scrollBarVis && settings.scrollBarVis !== undefined ) {
			settings.scrollBarVis = scrollBarVis;
			_fnAdjustColumnSizing( settings );
			return; // adjust column sizing will call this function again
		}
		else {
			settings.scrollBarVis = scrollBarVis;
		}
	
		/*
		 * 1. Re-create the table inside the scrolling div
		 */
	
		// Remove the old minimised thead and tfoot elements in the inner table
		table.children('thead, tfoot').remove();
	
		if ( footer ) {
			footerCopy = footer.clone().prependTo( table );
			footerTrgEls = footer.find('tr'); // the original tfoot is in its own table and must be sized
			footerSrcEls = footerCopy.find('tr');
		}
	
		// Clone the current header and footer elements and then place it into the inner table
		headerCopy = header.clone().prependTo( table );
		headerTrgEls = header.find('tr'); // original header is in its own table
		headerSrcEls = headerCopy.find('tr');
		headerCopy.find('th, td').removeAttr('tabindex');
	
	
		/*
		 * 2. Take live measurements from the DOM - do not alter the DOM itself!
		 */
	
		// Remove old sizing and apply the calculated column widths
		// Get the unique column headers in the newly created (cloned) header. We want to apply the
		// calculated sizes to this header
		if ( ! scrollX )
		{
			divBodyStyle.width = '100%';
			divHeader[0].style.width = '100%';
		}
	
		$.each( _fnGetUniqueThs( settings, headerCopy ), function ( i, el ) {
			idx = _fnVisibleToColumnIndex( settings, i );
			el.style.width = settings.aoColumns[idx].sWidth;
		} );
	
		if ( footer ) {
			_fnApplyToChildren( function(n) {
				n.style.width = "";
			}, footerSrcEls );
		}
	
		// Size the table as a whole
		sanityWidth = table.outerWidth();
		if ( scrollX === "" ) {
			// No x scrolling
			tableStyle.width = "100%";
	
			// IE7 will make the width of the table when 100% include the scrollbar
			// - which is shouldn't. When there is a scrollbar we need to take this
			// into account.
			if ( ie67 && (table.find('tbody').height() > divBodyEl.offsetHeight ||
				divBody.css('overflow-y') == "scroll")
			) {
				tableStyle.width = _fnStringToCss( table.outerWidth() - barWidth);
			}
	
			// Recalculate the sanity width
			sanityWidth = table.outerWidth();
		}
		else if ( scrollXInner !== "" ) {
			// legacy x scroll inner has been given - use it
			tableStyle.width = _fnStringToCss(scrollXInner);
	
			// Recalculate the sanity width
			sanityWidth = table.outerWidth();
		}
	
		// Hidden header should have zero height, so remove padding and borders. Then
		// set the width based on the real headers
	
		// Apply all styles in one pass
		_fnApplyToChildren( zeroOut, headerSrcEls );
	
		// Read all widths in next pass
		_fnApplyToChildren( function(nSizer) {
			headerContent.push( nSizer.innerHTML );
			headerWidths.push( _fnStringToCss( $(nSizer).css('width') ) );
		}, headerSrcEls );
	
		// Apply all widths in final pass
		_fnApplyToChildren( function(nToSize, i) {
			// Only apply widths to the DataTables detected header cells - this
			// prevents complex headers from having contradictory sizes applied
			if ( $.inArray( nToSize, dtHeaderCells ) !== -1 ) {
				nToSize.style.width = headerWidths[i];
			}
		}, headerTrgEls );
	
		$(headerSrcEls).height(0);
	
		/* Same again with the footer if we have one */
		if ( footer )
		{
			_fnApplyToChildren( zeroOut, footerSrcEls );
	
			_fnApplyToChildren( function(nSizer) {
				footerContent.push( nSizer.innerHTML );
				footerWidths.push( _fnStringToCss( $(nSizer).css('width') ) );
			}, footerSrcEls );
	
			_fnApplyToChildren( function(nToSize, i) {
				nToSize.style.width = footerWidths[i];
			}, footerTrgEls );
	
			$(footerSrcEls).height(0);
		}
	
	
		/*
		 * 3. Apply the measurements
		 */
	
		// "Hide" the header and footer that we used for the sizing. We need to keep
		// the content of the cell so that the width applied to the header and body
		// both match, but we want to hide it completely. We want to also fix their
		// width to what they currently are
		_fnApplyToChildren( function(nSizer, i) {
			nSizer.innerHTML = '<div class="dataTables_sizing">'+headerContent[i]+'</div>';
			nSizer.childNodes[0].style.height = "0";
			nSizer.childNodes[0].style.overflow = "hidden";
			nSizer.style.width = headerWidths[i];
		}, headerSrcEls );
	
		if ( footer )
		{
			_fnApplyToChildren( function(nSizer, i) {
				nSizer.innerHTML = '<div class="dataTables_sizing">'+footerContent[i]+'</div>';
				nSizer.childNodes[0].style.height = "0";
				nSizer.childNodes[0].style.overflow = "hidden";
				nSizer.style.width = footerWidths[i];
			}, footerSrcEls );
		}
	
		// Sanity check that the table is of a sensible width. If not then we are going to get
		// misalignment - try to prevent this by not allowing the table to shrink below its min width
		if ( table.outerWidth() < sanityWidth )
		{
			// The min width depends upon if we have a vertical scrollbar visible or not */
			correction = ((divBodyEl.scrollHeight > divBodyEl.offsetHeight ||
				divBody.css('overflow-y') == "scroll")) ?
					sanityWidth+barWidth :
					sanityWidth;
	
			// IE6/7 are a law unto themselves...
			if ( ie67 && (divBodyEl.scrollHeight >
				divBodyEl.offsetHeight || divBody.css('overflow-y') == "scroll")
			) {
				tableStyle.width = _fnStringToCss( correction-barWidth );
			}
	
			// And give the user a warning that we've stopped the table getting too small
			if ( scrollX === "" || scrollXInner !== "" ) {
				_fnLog( settings, 1, 'Possible column misalignment', 6 );
			}
		}
		else
		{
			correction = '100%';
		}
	
		// Apply to the container elements
		divBodyStyle.width = _fnStringToCss( correction );
		divHeaderStyle.width = _fnStringToCss( correction );
	
		if ( footer ) {
			settings.nScrollFoot.style.width = _fnStringToCss( correction );
		}
	
	
		/*
		 * 4. Clean up
		 */
		if ( ! scrollY ) {
			/* IE7< puts a vertical scrollbar in place (when it shouldn't be) due to subtracting
			 * the scrollbar height from the visible display, rather than adding it on. We need to
			 * set the height in order to sort this. Don't want to do it in any other browsers.
			 */
			if ( ie67 ) {
				divBodyStyle.height = _fnStringToCss( tableEl.offsetHeight+barWidth );
			}
		}
	
		/* Finally set the width's of the header and footer tables */
		var iOuterWidth = table.outerWidth();
		divHeaderTable[0].style.width = _fnStringToCss( iOuterWidth );
		divHeaderInnerStyle.width = _fnStringToCss( iOuterWidth );
	
		// Figure out if there are scrollbar present - if so then we need a the header and footer to
		// provide a bit more space to allow "overflow" scrolling (i.e. past the scrollbar)
		var bScrolling = table.height() > divBodyEl.clientHeight || divBody.css('overflow-y') == "scroll";
		var padding = 'padding' + (browser.bScrollbarLeft ? 'Left' : 'Right' );
		divHeaderInnerStyle[ padding ] = bScrolling ? barWidth+"px" : "0px";
	
		if ( footer ) {
			divFooterTable[0].style.width = _fnStringToCss( iOuterWidth );
			divFooterInner[0].style.width = _fnStringToCss( iOuterWidth );
			divFooterInner[0].style[padding] = bScrolling ? barWidth+"px" : "0px";
		}
	
		// Correct DOM ordering for colgroup - comes before the thead
		table.children('colgroup').insertBefore( table.children('thead') );
	
		/* Adjust the position of the header in case we loose the y-scrollbar */
		divBody.scroll();
	
		// If sorting or filtering has occurred, jump the scrolling back to the top
		// only if we aren't holding the position
		if ( (settings.bSorted || settings.bFiltered) && ! settings._drawHold ) {
			divBodyEl.scrollTop = 0;
		}
	}
Update the header, footer and body tables for resizing - i.e. column
alignment.

Welcome to the most horrible function DataTables. The process that this
function follows is basically:
  1. Re-create the table inside the scrolling div
  2. Take live measurements from the DOM
  3. Apply the measurements to align the columns
  4. Clean up

 @param {object} settings dataTables settings object
 @memberof DataTable#oApi