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var mybg = document.createElement("div");
//弹出层
function d_x(){
var h = document.body.clientHeight;
var w = document.body.clientWidth;
myAlert = document.getElementById("alert");
myAlert.style.display = "block";
myAlert.style.position = "absolute";
myAlert.style.top = (h/2)+"px";
myAlert.style.left = (w/2)+"px";
//myAlert.style.marginTop = "-200px";
//myAlert.style.marginLeft = "-250px";
mybg.setAttribute("id","mybg");
mybg.style.background = "#000";
mybg.style.display = "block";
mybg.style.width = "100%";
mybg.style.height = h+"px";
mybg.style.position = "absolute";
mybg.style.top = "0";
mybg.style.left = "0";
mybg.style.zIndex = "500";
mybg.style.opacity = "0.5";
mybg.style.filter = "Alpha(opacity=40)";
document.body.appendChild(mybg);
document.body.style.overflow = "hidden";
if(isIE){
if(isIE6){
myAlert.style.position = "absolute";
}
}
else{
myAlert.style.position = "fixed";
}
//myAlert.style.position = "absolute";
myAlert.style.position = "fixed";
//myAlert.style.position = "absolute";
myAlert.style.position = "fixed"; //不过对IE6-不起作用,你需要使用计时器移动层