https://galaga.com/js/jquery.rollover.js

1/************************************************
2  
3    Site Name: 
4	Description: common script
5	Version: 1.0
6	Author: 
7	Last Modified :
8
9************************************************/
10$(function() {
11	
12	var targetImgs = $("a > img");
13	
14	var currentId = $("body").attr("id");
15	
16	targetImgs.each(function() {
17		
18		if(this.src.match("_off")) {
19			
20			this.rollOverImg = new Image();
21			this.rollOverImg.src = this.getAttribute("src").replace("_off", "_on");;
22			$(this.rollOverImg).css({position: "absolute",opacity: 0})
23					.addClass('overEff');
24			$(this).before(this.rollOverImg);
25			
26			$(this.rollOverImg).mousedown(function(){
27				$(this).stop().animate({opacity: 0}, {duration: 0, queue: false});
28			});
29			
30			$(this.rollOverImg).hover(function(){
31				$(this).animate({opacity: 1}, {duration: 0, queue: false});
32			},
33			function(){
34				$(this).animate({opacity: 0}, {duration: 0, queue: false});
35			});
36			
37		}
38	});
39});