$(window).bind('load', function() {
			var preload = new Array();
			$(".rollover").each(function() {
				s = $(this).attr("src").replace("_up","_over");
				preload.push(s)
			});
			var img = document.createElement('img');
			$(img).bind('load', function() {
				if(preload[0]) {
					this.src = preload.shift();
				}
			}).trigger('load');
		});