javascript xml为数据源的下拉框

页面代码:
<html> 
<head> 
<script language="JavaScript" for="window" event="onload"> 
var xmlDoc = new ActiveXObject("Microsoft.XMLDOM"); 
var i=0; 
var j=0; 

loadXML(); 
function loadXML(){ 
xmlDoc.async="false"; 
xmlDoc.load("account.xml"); 
xmlObj=xmlDoc.documentElement;  
nodes = xmlDoc.documentElement.childNodes; 
document.frm.mainclass.options.length = 0;  
for (i=0;i<xmlObj.childNodes.length;i++){ 
labels=xmlObj.childNodes(i).getAttribute("display_name"); 
values=xmlObj.childNodes(i).text; 
document.frm.mainclass.add(document.createElement("OPTION")); 
document.frm.mainclass.options[i].text=labels;  
document.frm.mainclass.options[i].value=values; 

} 
} 

</script> 

<title>在HTML中调用XML数据</title> 
</head> 
<body bgcolor="#FFFFFF"> 
<FORM  name="frm">  
类型<SELECT  name="mainclass" ></SELECT> 
<option selected value="" ></option> 

</form> 
</body> 
</html>

xml:
<?xml version="1.0" encoding="GB2312"?> 
<item> 
<class display_name="用户ID"> USER_ID
</class> 
<class display_name="密码">PWD
</class> 
<class display_name="用户名称"> USERNAME
</class>
<class display_name="性别"> XB
</class>
<class display_name="部门ID">BMID
</class>

</item>

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