IE select 控件总在div的上面显示的BUG修正

//xu.browser.ie.hacker IE hacker
/**
* 依赖文件 core.js array.js browser.js dom.js
*/
if (xu.browser.$IE){

var arVersion = navigator.appVersion.split("MSIE");
xu.browser.ie.version = parseFloat(arVersion[1]);
arVersion = null ;
/**
* <!--[if lte IE 6.5]>
* <script type="text/javascript" src="browser.ie.js"></script>
* <![endif]-->
*/
xu.browser.ie.hacker.bgImgCache = function(){
//启用 背景图片缓存
try {
document.execCommand("BackgroundImageCache", false, true)
} catch (e) {}
} ;
xu.browser.ie.hacker.pngFixed = function(){
if ((xu.browser.ie.version >= 5.5) && (document.body.filters))
{
for(var j=0; j<document.images.length; j++){
var img = document.images[j];
var imgName = img.src.toUpperCase();
if (imgName.substring(imgName.length-3, imgName.length) == "PNG"){
var imgID = (img.id) ? "id='" + img.id + "' " : "";
var imgClass = (img.className) ? "class='" + img.className + "' " : "";
var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' ";
var imgStyle = "display:inline-block;" + img.style.cssText ;
if (img.align == "left") imgStyle = "float:left;" + imgStyle;
if (img.align == "right") imgStyle = "float:right;" + imgStyle;
if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle;
var strNewHTML = "<span " + imgID + imgClass + imgTitle + " style=\"" +
"width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";" +
"filter:progid:DXImageTransform.Microsoft.AlphaImageLoader" +
"(src=\'" + img.src + "\', sizingMethod='scale');\"></span>" ;
img.outerHTML = strNewHTML ;
j = j-1 ;
}
}
}
} ;

/**
* IE select 控件总在div的上面显示的BUG修正,这里使用隐藏select的方式,依赖下面这段代码
*/
var ie_select_bug = true ;
xu.browser.ie.hacker.SelectBug = function(){
this.select_array = $TagN('select') ;
this.hadFixed = false ;
this.doFix = function(){
if (this.select_array && this.select_array.length > 0){
xu.array.each(this.select_array,function(arr_e,index){
arr_e.style.display = 'none';
return arr_e ;
});
this.hadFixed = true ;
}
};
this.notFix = function(){
if (this.hadFixed){
xu.array.each(this.select_array,function(arr_e,index){
arr_e.style.display = '';
return arr_e ;
});
this.hadFixed = false ;
}
};
return this ;
} ;
var SelectBugFixed = new xu.browser.ie.hacker.SelectBug();

xu.browser.ie.hacker.bgImgCache();
xu.ready(function(){
xu.browser.ie.hacker.pngFixed();
});
}