function Ajax(sUrl,sRecvTyp,sQueryString,oResultFunc) { 
	this.Url = sUrl; 
	this.QueryString = sQueryString; 
	this.XmlHttp = this.createXMLHttpRequest(); 
	if (this.XmlHttp == null) { 
	alert("erro"); 
	return; 
} 
var objxml = this.XmlHttp; 
objxml.onreadystatechange = function (){Ajax.handleStateChange(objxml,sRecvTyp,oResultFunc)}; 
} 
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.QueryString; 
	return queryString; 
} 
Ajax.prototype.get = function () { 
	sUrl = this.Url; 
	var queryString = sUrl+"?timeStamp=" + new Date().getTime() + "&" + this.createQueryString(); 
	this.XmlHttp.open("GET",queryString,true); 
	this.XmlHttp.send(null); 
} 
Ajax.prototype.post = function() { 
	sUrl = this.Url; 
	var sUrl = sUrl + "?timeStamp=" + new Date().getTime(); 
	var queryString = this.createQueryString(); 
	this.XmlHttp.open("POST",sUrl,true); 
	this.XmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); 
	this.XmlHttp.send(queryString); 
} 
Ajax.handleStateChange = function (XmlHttp,sRecvTyp,oResultFunc) { 
if (XmlHttp.readyState == 4) { 
	  if (XmlHttp.status == 200) { 
	  	oResultFunc(sRecvTyp?XmlHttp.responseXML:XmlHttp.responseText); 
	  } else { 
	  	alert("您所请求的页面有异常。"); 
	  } 
}else{ 
  oResultFunc("<font style='color:FF0000'>Loading......</font>") 
} 


}//end function ajax