关于下拉列表排序的问题?

xml文档:
<?xml version="1.0" standalone="yes"?> 
<CATALOG>
<HOUSE>
  <DISTRICT>yantian</DISTRICT> 
  <NAME>lanhuahu</NAME> 
  <DEVELOPER>jinke</DEVELOPER>  
  <NUMBER>20750</NUMBER>
  <HOT>1</HOT>
</HOUSE>
<HOUSE>
  <DISTRICT>yantian</DISTRICT> 
  <NAME>meilanju</NAME> 
  <DEVELOPER>jinke</DEVELOPER>  
  <NUMBER>30655</NUMBER>
  <HOT>0</HOT>
</HOUSE>
<HOUSE>
  <DISTRICT>nanshan</DISTRICT> 
  <NAME>kekexili</NAME> 
  <DEVELOPER>longhu</DEVELOPER>
  <NUMBER>21590</NUMBER>
  <HOT>0</HOT> 
</HOUSE>
<HOUSE>
  <DISTRICT>nanshan</DISTRICT> 
  <NAME>gaoshanhuayuan</NAME> 
  <DEVELOPER>longhu</DEVELOPER> 
  <NUMBER>26205</NUMBER>
  <HOT>1</HOT>
</HOUSE>
<HOUSE>
  <DISTRICT>yantian</DISTRICT> 
  <NAME>fengjingwuxian</NAME> 
  <DEVELOPER>longhu</DEVELOPER> 
  <NUMBER>20100</NUMBER>
  <HOT>1</HOT>
</HOUSE>
<HOUSE>
  <DISTRICT>baoan</DISTRICT> 
  <NAME>shencaifeiyang</NAME> 
  <DEVELOPER>longhu</DEVELOPER> 
  <NUMBER>20400</NUMBER>
  <HOT>0</HOT>
</HOUSE>
<HOUSE>
  <DISTRICT>yantian</DISTRICT> 
  <NAME>binfenwuxian</NAME> 
  <DEVELOPER>yongyou</DEVELOPER>
  <NUMBER>20300</NUMBER>
  <HOT>0</HOT> 
</HOUSE>
  </CATALOG>
HTML文档:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script type="text/javascript">
   function changPage(url) 
      { 
         if(url!= "")
            { 
               window.open("http://"+url); 
             } 
       } 
function getlist(area,type)
{    
var xmlDoc=null;
if(window.ActiveXObject)
{
xmlDoc=new ActiveXObject("Microsoft.XMLDOM");}
else if (document.implementation.createDocument)
{
xmlDoc=document.implementation.createDocument("","",null);
}
else
{
alert('Your browser cannot handle this script');
}if (xmlDoc!=null)
{ 
xmlDoc.async=false;
xmlDoc.load("catalog.xml");
var x=xmlDoc.getElementsByTagName("HOUSE");
var area;
var type;
document.write("<select name='楼盘名' size='type' onchange=changPage('bbs.szhome.com/'+this.options[this.selectedIndex].value)>");
document.write("<option>--选择--");
for (i=0;i<x.length;i++)
{  
  if(x[i].getElementsByTagName("DISTRICT")[0].childNodes[0].nodeValue==area)
     {  
        document.write("<option value="+x[i].getElementsByTagName("NUMBER")[0].childNodes[0].nodeValue+">");
        document.write(x[i].getElementsByTagName("NAME")[0].childNodes[0].nodeValue);
   }
}
document.write("</select>"); 
}
}</script></head><body>
<script type="text/javascript">getlist("baoan","");
</script>
<br><br>
<script type="text/javascript">getlist("nanshan","");
</script>
<br><br>
<script type="text/javascript">getlist("yantian","");
</script></body>
</html>现在我想把XML数据中的ＨＯＴ标签为１的ＮＡＭＥ显示在下拉列表框的前端，其他的ＮＡＭＥ再根据首字母进行排序．
还请多多指教？