局部刷新

var updateReq;
	
	function createAjaxObj() {
		if (window.ActiveXObject) {
			updateReq = new ActiveXObject("Microsoft.XMLHTTP");
		}
		else if (window.XMLHttprequest) {
			updateReq = new XMLHttpRequest();
		}
	}
	
	function change() {
	var userDept = document.getElementById('userDept').value;
		if ("" != userDept) {
			deptChange();
		}
		return true;
	}
	
	function deptChange() {
		createAjaxObj();
		if (updateReq.readyState == 4 || updateReq.readyState == 0) {
			var dept = document.getElementById('userDept').value;
			updateReq.open('POST','/manpower/findSecByAjax.do?dept='+dept);
			updateReq.onreadystatechange = handleUpdateToDo;
			updateReq.send();
		}
	}
	
	function handleUpdateToDo () {
		if (updateReq.readyState == 4) {
			var upd = document.getElementById('userSecDiv');
			upd.innerHTML='';
			var str = updateReq.responseText;
			upd.innerHTML = str;
		}
	}