code: 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
  		if ( ! DataTable.__scrollbarWidth ) {
  			var inner = $('<p/>').css( {
  				width: '100%',
  				height: 200,
  				padding: 0
  			} )[0];
  	
  			var outer = $('<div/>')
  				.css( {
  					position: 'absolute',
  					top: 0,
  					left: 0,
  					width: 200,
  					height: 150,
  					padding: 0,
  					overflow: 'hidden',
  					visibility: 'hidden'
  				} )
  				.append( inner )
  				.appendTo( 'body' );
  	
  			var w1 = inner.offsetWidth;
  			outer.css( 'overflow', 'scroll' );
  			var w2 = inner.offsetWidth;
  	
  			if ( w1 === w2 ) {
  				w2 = outer[0].clientWidth;
  			}
  	
  			outer.remove();
  	
  			DataTable.__scrollbarWidth = w1 - w2;
  		}
  	
  		return DataTable.__scrollbarWidth;
  	}
docs: Get the width of a scroll bar in this browser being used
  @returns {int} width in pixels
  @memberof DataTable#oApi