var loader = {
	preloader: {
		loadedImages: [],
		load: function (url){
			var img = this.loadedImages;
			var l = img.length;
			img[l] = new Image();
			img[l].src = url;
		}
	}
};

$(function(){
	$('.link a img').each(function(){
		this.originalSrc = $(this).attr('src');
		this.rolloverSrc = this.originalSrc.replace(/(\.gif|\.jpg|\.png)/, "_on$1");
		loader.preloader.load(this.rolloverSrc);
	}).hover(function(){
		if($(this).attr("className")!="active"){
			$(this).attr('src',this.rolloverSrc);
		}
	},function(){
		if($(this).attr("className")!="active"){
			$(this).attr('src',this.originalSrc);
		}
	});

});