ajax OPTION

        function loadSTEEL_NUM(TYPEID){
        var drp2 = $("drSTEEL_NUM"); 
        drp2.options.length=0;
        downloadUrl('BSOrder_STEEL_NUM.aspx?B_TYPEID='+TYPEID, function (xml, responseCode) {
            var dom
            if(document.all)//ie
            {
              dom=new ActiveXObject("microsoft.xmldom");
              dom.loadXML(xml)
            }
            else if(window.DOMParser)//firefox
             dom=new DOMParser().parseFromString(xml,"text/xml");
            if(dom)
            {
              items1 = dom.getElementsByTagName("item");
              var itemsLength=items1.length; 
              for(i=0;i <itemsLength;i++)                                                              
              { 
                      var newOption = document.createElement("OPTION"); 
                      newOption.text=items1[i].getAttribute("name");
                      newOption.value= items1[i].getAttribute("name"); 
                      drp2.options.add(newOption); 
              }
              } 
          });

<items>
 <item name="abc"></item>
</items>