function InitAjax()
{
	var http_request=false; 
  if (window.XMLHttpRequest) { // Mozilla
	  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('Giving up :( Cannot create an XMLHTTP instance');
    return false;
  }
	return http_request;
}

function reloadLoginStatus()
{
	//需要进行Ajax的URL地址
	var url = "/JS/loginstatus.asp?dummy=" + new Date().getTime();

	//获取新闻显示层的位置
	var show = document.getElementById("userLogin"); 

	//实例化Ajax对象
	var ajax = InitAjax();

	//使用Get方式进行请求
	ajax.open("GET", url, true);

	//获取执行状态
	ajax.onreadystatechange = function() { 
		//如果执行是状态正常，那么就把返回的内容赋值给上面指定的层
		if (ajax.readyState == 4 && ajax.status == 200) { 
			show.innerHTML = ajax.responseText; 
			//show.innerHTML=reCode(ajax.responseBody);
		} 
	}

	//发送空
	ajax.send(null); 
}