var Ka=navigator.userAgent.toLowerCase();
var rt=Ka.indexOf("opera")!=-1;
var r=Ka.indexOf("msie")!=-1&&(document.all&&!rt);
var fG=r&&Ka.indexOf("msie 5")!=-1;
var FG=r&&Ka.indexOf("msie 6")!=-1;
var GG=r&&Ka.indexOf("msie 7")!=-1;
var gG=Ka.indexOf("konqueror")!=-1;
var O=Ka.indexOf("safari")!=-1||gG;
var eG=Ka.indexOf("camino")!=-1;
var X=!r&&(!O&&(Ka.indexOf("mozilla")!=-1||rt));
var hG=Ka.indexOf("macintosh")!=-1;
var HG=Ka.indexOf("linux")!=-1;
var iG=Ka.indexOf("windows nt 5.1")!=-1||Ka.indexOf("windows xp")!=-1;
var dG=Ka.indexOf("windows nt 5.0")!=-1||Ka.indexOf("windows 2000")!=-1;
var tG=iG||dG;



//var SITE_URL = "http://i.checkoo.com";
//var SITE_URL = "http://"+location.hostname;
var SITE_URL = "http://"+location.host;

//ajax xmlhttprequest
function newXMLHttpRequest() {
	/*
  var xmlreq = false;
  if (window.ActiveXObject) {
    try {
      xmlreq = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e1) {
      try {
        xmlreq = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (e2) {
      }
    }
  }else if (window.XMLHttpRequest) {
    xmlreq = new XMLHttpRequest();
  } else 
  return xmlreq;
  */
  var xmlreq = false;
  try{
		xmlreq = new ActiveXObject('MSXML2.XMLHTTP.5.0');
	}catch(e){
	try{
		xmlreq = new ActiveXObject('MSXML2.XMLHTTP.4.0');
	}catch(e){
		try{
			xmlreq = new ActiveXObject('MSXML2.XMLHTTP.3.0');
		}catch(e){
			try{
				xmlreq = new ActiveXObject('MSXML2.XMLHTTP.2.6');
			}catch(e){
				try{
					xmlreq = new ActiveXObject('MSXML2.XMLHTTP');
				}catch(e){
					try{
						xmlreq = new ActiveXObject('Microsoft.XMLHTTP');
					}catch(e){
						try{
							xmlreq = new XMLHttpRequest();
						}catch(e){
							xmlreq = false;
						}
					}
				}
			}
		}
	}
 }
  return xmlreq;
}

//send ajax get request
function doGet (url) {
	var xmlreq = newXMLHttpRequest();
	var result = "";
	//msie
	if (r){
		xmlreq.onreadyStatechange=function() {
				if (xmlreq.readyState == 4){
						if (xmlreq.status == 200){
								result = xmlreq.responseText;
						}//200
						else{
							result = "服务器错误："+xmlreq.status;
						}
				}//
			}
	}
	//mozilla
	else if (X){
		xmlreq.onload=function() {
			result = xmlreq.responseText;
		}
	}
	else {
		result = "您的浏览器不支持ajax";
	}
	xmlreq.open("GET",url,false);
	xmlreq.send(null);

	return result;
}

//send ajax post  request 
function doPost (url , data) {
	var xmlreq = newXMLHttpRequest();
	var result = "";
	//msie
	if (r){
		xmlreq.onreadyStatechange=function() {
			if (xmlreq.readyState == 4){
					if (xmlreq.status == 200){
						result = xmlreq.responseText;
					}//200
					else{
						result = "服务器错误："+xmlreq.status;
					}
			}//readyStat != 4
			/*
			else{
				result = "服务器错误："+xmlreq.status;
			}
			*/
		}
	}
	//mozilla
	else if (X){
		xmlreq.onload=function() {
			result = xmlreq.responseText;
		}
	}
	else {
		result = "您的浏览器不支持ajax";
	}

	xmlreq.open("POST",url,false);
	xmlreq.setRequestHeader("Content-Length",data.length);    
	xmlreq.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	xmlreq.send(data);

	return result;
}