var xmlhttp;

	function getXmlhttp(){
		if(window.ActiveXObject){
			xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
		else if(window.XMLHttpRequest){
			xmlhttp=new XMLHttpRequest();
		}
	}
	function changehandle(){
		if(xmlhttp.readyState==4)
		{					
			if(xmlhttp.status==200) 
			{	
				var content=xmlhttp.responseXML;
				var smalljobstycle=content.getElementsByTagName("city");	
					
				for(var i=0;i<smalljobstycle.length;i++){
					var id=smalljobstycle[i].getElementsByTagName("id")[0].firstChild.nodeValue;
					var name=smalljobstycle[i].getElementsByTagName("name")[0].firstChild.nodeValue;
					var smalljobstycle1=new Option();
					smalljobstycle1.value=id;
					smalljobstycle1.text=name;
					document.SearchFrm.smalljobstycle.add(smalljobstycle1);
				}
			}
			else{
				alert("数据连接有误，请重试！");
			}
		}
	}
	function select(aa){
		if(window.SearchFrm.jobstycle.value!=""){
			window.SearchFrm.smalljobstycle.options.length=0; 
			getXmlhttp();
			var date=new Date();
			//var id=aa.value;
			
			var url="servlet/duty?fid="+aa;
			xmlhttp.open("get",url,true);
			xmlhttp.onreadystatechange=changehandle; 
			xmlhttp.send(null);  
		}else{
		 	window.SearchFrm.smalljobstycle.options.length=0;
		 	var smalljobstycle = document.SearchFrm.smalljobstycle.value;
		  	if(smalljobstycle == ''){
		  		var varItem = new Option("不限---------------","");
		       	document.SearchFrm.smalljobstycle.options.add(varItem);
		  	}
		}
	}
		function onCity(){
			var addr = document.SearchFrm.addr.value;
			if(addr==''){
					document.SearchFrm.city.options.length=0;
				 	var city = document.SearchFrm.city.value;
				  	if(city == ''){
				  		var varItem = new Option("城市","");
				       	document.SearchFrm.city.options.add(varItem);
				  	}
			}
		}