function _fnScrollBarWidth ()
	{
		// On first run a static variable is set, since this is only needed once.
		// Subsequent runs will just use the previously calculated value
		var width = DataTable.__scrollbarWidth;
	
		if ( width === undefined ) {
			var sizer = $('<p/>').css( {
					position: 'absolute',
					top: 0,
					left: 0,
					width: '100%',
					height: 150,
					padding: 0,
					overflow: 'scroll',
					visibility: 'hidden'
				} )
				.appendTo('body');
	
			width = sizer[0].offsetWidth - sizer[0].clientWidth;
			DataTable.__scrollbarWidth = width;
	
			sizer.remove();
		}
	
		return width;
	}
Get the width of a scroll bar in this browser being used
 @returns {int} width in pixels
 @memberof DataTable#oApi