function Ajax(url,recvT,stringS,resultF) {
	this.url = url;
	this.stringS = stringS;
	this.xmlHttp = this.createXMLHttpRequest();
	if (this.xmlHttp == null) {
		alert("error");
        return;
    }
	var objxml = this.xmlHttp;
	objxml.onreadystatechange = function (){Ajax.handleStateChange(objxml,recvT,resultF)};
}

Ajax.prototype.createXMLHttpRequest = function() {
    try { return new ActiveXObject("Msxml2.XMLHTTP");    } catch(e) {}
    try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {}
    try { return new XMLHttpRequest();                   } catch(e) {}
    return null;
}

Ajax.prototype.createQueryString = function () {
	var queryString = this.stringS;
	return queryString;
}

Ajax.prototype.get = function () {
	url = this.url;
	var queryString = url+"?timeStamp=" + new Date().getTime() + "&" + this.createQueryString();
	this.xmlHttp.open("GET",queryString,true);
	this.xmlHttp.send(null);
}

Ajax.prototype.post = function() {
	url = this.url;
	var url = url + "?timeStamp=" + new Date().getTime();
	var queryString = this.createQueryString();
	this.xmlHttp.open("POST",url,true);
	this.xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	this.xmlHttp.send(queryString);
}
	
Ajax.handleStateChange = function (xmlHttp,recvT,resultF) {
	if (xmlHttp.readyState == 4) {
		if (xmlHttp.status == 200) {
		resultF(recvT==0?xmlHttp.responseXML:xmlHttp.responseText);
		} else {
		alert("您所请求的页面有异常。");
		}
	}
}