var http_request = false;
    function makeRequest_2(url) {
        http_request = false;
        String.prototype.replaceAll = function(search, replace)
        {
         var regex = new RegExp(search, "g");
         return this.replace(regex, replace);
        }                   
        if (window.XMLHttpRequest) { 
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType) {
                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) {
            alert('错误，不能建立XMLHTTP instance');
            return false;
        }
        http_request.onreadystatechange = alertContents_2;
        http_request.open('POST', url, true);
        http_request.send(null);
    }
    function alertContents_2() {
        if (http_request.readyState == 1) {
	    car_login.innerHTML="请求已经建立";
		}
        if (http_request.readyState == 2) {
	    car_login.innerHTML="请求已经发出正在处理之中";
		}
        if (http_request.readyState == 3) {
	    car_login.innerHTML="请求已经处理，响应中…………";
		}
        if (http_request.readyState == 4) {
            if (http_request.status == 200) {
            var response = http_request.responseText.split("|");
	        car_login.innerHTML=http_request.responseText;
            }
			else {
	        car_login.innerHTML="网站未知错误"+http_request.status;
            }
        }
    }