(function(){
function rollover(){
var targetClassName = "hover";
var suffix = "_hover";
var overReg = new RegExp("^(.+)(\\.[a-z]+)$");
var outReg = new RegExp("^(.+)" + suffix + "(\\.[a-z]+)$");
var preload = new Array();
var images = document.getElementsByTagName("img");
for (var i = 0, il = images.length; i < il; i++) {
var classStr = images[i].getAttribute("class") || images[i].className;
var classNames = classStr.split(/\s+/);
for(var j = 0, cl = classNames.length; j < cl; j++){
if(classNames[j] == targetClassName){
preload[i] = new Image();
preload[i].src = images[i].getAttribute("src").replace(overReg, "$1" + suffix + "$2");
images[i].onmouseover = function() {
this.src = this.getAttribute("src").replace(overReg, "$1" + suffix + "$2");
}
images[i].onmouseout = function() {
this.src = this.getAttribute("src").replace(outReg, "$1$2");
}
}
}
}
}
function addEvent(elem,event,func){
if(elem.addEventListener) {
elem.addEventListener(event, func, false);
}else if(elem.attachEvent) {
elem.attachEvent("on" + event, func);
}
}
addEvent(window,"load",rollover);
})();