<script type="text/javascript">
function initFade(){
        var windowbg = document.getElementById("fade");
        //windowbg.id = "windowbg";
        with(windowbg.style) {
      // position = "fixed";
   position = "absolute";
        background = "#fff";
        width = document.documentElement.scrollWidth+"px";
clientHeight= document.documentElement.clientHeight;
scrollHeight = document.documentElement.scrollHeight;
if(scrollHeight > clientHeight){
height = document.documentElement.scrollHeight+"px";
}else{
height = document.documentElement.clientHeight+"px";
}
        
        top = "0px";
        left = "0px";
        filter="Alpha(opacity=50)";
        opacity = 0.5;
        zIndex=999;
        }
    }
</script>这一段代码是做的一个弹出层的,但是在ie下老弹出syntax error的错误,在第一行。。谁能告诉我哪里错了???