var xmlHttp;
	
      function createXMLHttpRequest(){
        if (window.ActiveXObject){
             xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
        }else if(window.XMLHttpRequest){
             xmlHttp = new XMLHttpRequest();
          }
      }
      //提交应用系统下拉框选择内容
      function select_change(){          
             var sysId = document.getElementById("sysid").value;
           
             if(sysId!="null"){
                 createXMLHttpRequest();
              var url="/t2cncs/servlet/ParentMenuHandle?sysId="+sysId;
              xmlHttp.open("GET",url,true);
              xmlHttp.onreadystatechange = showMembers;
              xmlHttp.send(null);
      		}            
      }
      function showMembers(){         

               if (xmlHttp.readyState == 4) { 

                           if (xmlHttp.status == 200) {
       							var membersData = xmlHttp.responseXML.getElementsByTagName("menu");
        						var membersSelect = document.getElementById("parentid");
       							var option = null;
        						membersSelect.options.length = 0; 
 									var option1 = new Option("----请选择----","");
       								var option2 = new Option("父节菜单","-1","selected")  ;  
       								 membersSelect.options.add(option1);
       								 membersSelect.options.add(option2);    
        						//循环将数据插入列表框中
       							for(var i=0;i<membersData.length;i++){
            						var mdisplay=membersData[i].childNodes[0].firstChild.nodeValue;
              						var mvalue=membersData[i].childNodes[1].firstChild.nodeValue;
         						    var option=new Option(mvalue,mdisplay);
            						try{
             								membersSelect.options.add(option);          
       									}catch(e){
           									alert(e);
       									 }      
       								 }
								for(var i=0;i<membersSelect.options.length;i++)
								{
									if(membersSelect.options[i].value==parentId)
									{
										membersSelect.options[i].selected = true ;
										break ;	
									}
	   							}	 
										
       								

       			 		   } else { //页面不正常 
                    						  alert("您请求的页面有异常 "); 
                				 }  
                      } else { 
                               //  信息还没有返回，等待 
                             }             
      }