var http_request = false;
	function send_request(url) {
		http_request = false;
		//XMLHttpRequest
		if(window.XMLHttpRequest) { //Mozilla
			http_request = new XMLHttpRequest();
			if (http_request.overrideMimeType) {//MiME
				http_request.overrideMimeType('text/xml');
			}
		}
		else if (window.ActiveXObject) { // IE
			try {
				http_request = new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e) {
				try {
					http_request = new ActiveXObject("Microsoft.XMLHTTP");
				} catch (e) {}
			}
		}
		if (!http_request) { //
			window.alert("XMLHttpRequest is error.");
			return false;
		}
		http_request.onreadystatechange = processRequest;
		http_request.open("GET", url, true);
		http_request.send(null);
	}
	
    function processRequest() {
        if (http_request.readyState == 4)
        { 
            if (http_request.status == 200)
            {
                document.getElementById("pinError").innerHTML = http_request.responseText;
               // alert(http_request.responseText);
            }
            else
            {
                alert("请求发生错误！");
            }
        }
    }
	function userCheck(formName) {
		var f = document.forms[formName];
		var username = f.pin.value;
		if(username=="") {
			window.alert("用户名不能为空!");
			f.username.focus();
			return false;
		}
		else
		{
			var name = encodeURI(username);
			send_request(window.gloable_domain+'/validatePin.do?pin='+name+'&random='+Math.random());
		}
	}