function openWindow2(zindex,width,height,alpha){
    var iWidth = document.documentElement.scrollWidth; 
    var bgDiv = document.createElement("div");
    bgDiv.id="bg";
    bgDiv.style.cssText = "top:0;width:"+iWidth+"px;height:"+document.documentElement.scrollHeight+"px;filter:Alpha(Opacity="+alpha+");opacity:0.3;z-index:"+zindex+";";
    document.body.appendChild(bgDiv); 
    var msgDiv=document.createElement("div");
    msgDiv.id="msg";
    msgDiv.style.cssText ="position: absolute;z-index:"+(zindex+1)+";width:"+width+"px; height:"+(height=="auto"?height:(height+"px"))+";";
    document.body.appendChild(msgDiv);    
}