//建立XMLHttpRequest对象
function getHTTPObject() {
	var Ajax = false;
	try {
			Ajax = new ActiveXObject("Msxml2.XMLHTTP");
		    }catch (e1){
			    try {
				    Ajax = new ActiveXObject("Microsoft.XMLHTTP");
			        } catch (e2) {
				    Ajax = false;
			                     }
		               }
					   
		if (! Ajax) {
			if (typeof XMLHttpRequest != "undefined") {
				Ajax = new XMLHttpRequest();
			} else {
				Ajax = false;
			}
		}
		return Ajax
}
var http = getHTTPObject();

function chk_sub(){
var email=document.getElementById("email").value;
var uname=document.getElementById("uname").value;
var phone=document.getElementById("phone").value;
var city=document.getElementById("city").value;
var vdcode=document.getElementById("vdcode").value;

var d=new Date();
var url = "yuekan_account.php?email="+email+"&uname="+uname+"&phone="+phone+"&city="+city+"&vdcode="+vdcode+"&timestamp="+d.getTime();

//alert(url);   //测试用
http.open("get",url,true);
http.send(null);
http.onreadystatechange=showMsg;
}

function showMsg(){
	var d=new Date();
	if(http.readyState == 4){
	response = http.responseText;
	alert(response);
	document.getElementById("code_img").src="/img.php?"+d.getTime();
	}
}