一个简单的js渐显(fadeIn)渐隐(fadeOut)类

下面，贴代码：
代码如下:
/**
* @projectDescription 动画(渐显、渐隐)类
* /**
* @projectDescription KINGKIT UI
* @date 2010-6-1
* @author Kit.Liao
* @copyright kingkit.com.cn
* @version 0.9.0
* @感谢：http://www.cnblogs.com/rubylouvre/archive/2009/09/16/1566699.html
* 使用示例：渐显：KUI.Animation.fadeIn(el)；渐隐：KUI.Animation.fadeOut(el)
*/
KUI.Animation = {
fadeIn: function(id){
this.fade(id, true);
},
fadeOut: function(id){
this.fade(id, false);
},
fade: function(id, flag){
var target = KUI.get(id);
target.alpha = flag?1:100;
target.style.opacity = (target.alpha / 100);
target.style.filter = 'alpha(opacity=' + target.alpha + ')';
var value = target.alpha;
(function(){
target.style.opacity = (value / 100);
target.style.filter = 'alpha(opacity=' + value + ')';
if (flag) {
value++;
if (value <= 100) {
setTimeout(arguments.callee, 15);//继续调用本身
}
}
else {
value--;
if (value >= 0) {
setTimeout(arguments.callee, 15);//继续调用本身
}
}
})();
}
}

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fadeout fadein js