求助ie 错误 syntax error

[zt234380807]

<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？？？

[happy0000]

你要把整个代码贴出来啊，包括html和调用函数

[zt234380807]

代码太多了贴不上，js就那点代码了！！！其他浏览器都ok，就ie有问题！！！！