var objDd,objHd;
function ClassResult(ParentID,Dd,Hd)
{ 
   objDd = Dd;
   objHd = Hd;
    if(ParentID != "0")
    {
       var xmlhttp = create_xmlhttp(); 
       xmlhttp.open("GET", "/webservice/class.asmx/GetClassDataSet?ParentID="+ParentID, false); 
       xmlhttp.send(null);	
       if(xmlhttp.readyState == 4) 
       { 
       	    if(xmlhttp.status == 200) 
       	    { 	       		     
       		       var ds = xmlhttp.responseXML;        
		            if(ds != null && typeof(ds) == "object")
		            {   
	                    objDd.length = 0;　　                 
	                    objDd.options.add(new Option("Select","0"));   
		                   var nodes = ds.getElementsByTagName("ExecuteSql");		                 
			                for(var i = 0; i < nodes.length; i++)
　　　　                    {
                                var name = nodes[i].selectSingleNode("ClassName").text;
                                var id = nodes[i].selectSingleNode("ClassID").text;                                
                                objDd.options.add(new Option(name,id));                                
                                if(id == objHd.value) 
                                {               
			                      objDd.options[i + 1].selected = true;			     
			                    }			    
　　　　                     }
		            }
            }
        } 
    }
}