var xmlHttp
function createXMLHttpRequest() { 
	if(window.ActiveXObject) 
	{ 
		xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); 
	} 
	else if(window.XMLHttpRequest) 
	{ 
		xmlHttp = new XMLHttpRequest(); 
	} 
}
var re_url
function post_login(url) {
	re_url=url
	var datavalue;
	createXMLHttpRequest(); 
	datavalue="name="+escape(document.getElementById('name').value)+"&pwd="+escape(document.getElementById('pwd').value)+"&yz="+escape(document.getElementById('yz').value);
	xmlHttp.open("POST","/chkuser.asp",true); 
	xmlHttp.onreadystatechange=showResult; 
	xmlHttp.setrequestheader("cache-control","no-cache"); 
	xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	xmlHttp.send(datavalue); 
}
function showResult() { 
	if(xmlHttp.readyState==4){ 
		switch(xmlHttp.responseText){
			case "2":
				alert("验证码不能为空！");
				break;
			case "3":
				alert("用户名或密码不能为空！");
				break;
			case "4":
				alert("验证码不正确！");
				break;
			case "5":
				alert("账户不存在或错误！");
				break;
			case "6":
				alert("账户密码错误！");
				break;
			case "1":
				alert("登录成功！");
				 location=re_url;
	          break;
		}
		//alert(xmlHttp.responseText)
	} 
}
var srcmath="?"+Math.random();