function IsLogin()
{    
    var oHttpReq  = null;
    if(window.XMLHttpRequest)
    {
        oHttpReq = new XMLHttpRequest();
    }
    else
    {
        oHttpReq = new ActiveXObject("MSXML2.XMLHTTP");
    }
    oHttpReq.open("POST", "/public/islogin.aspx",false);
    oHttpReq.send(""); 
    result = oHttpReq.responseText; 
    return result;
}
 document.writeln(IsLogin());