function preloadImages()
	{
		for(i=6;i<=11;i++)
		{
			eval("var image_"+i+" = new Image(); image_"+i+".src = 'images/index_on_"+i+".gif';");
		}
	}
	function swapImage(id, state)
	{
		document.images["image_"+id].src = "images/index"+state+"_"+id+".gif";
	}