function  sendRequest(url,callback,postData)  {
        var  req  =  createXMLHTTPObject();
        if  (!req)  return;
        var  method  =  (postData)  ?  "POST"  :  "GET";
        req.open(method,url,true);
        req.setRequestHeader('User-­‐Agent','XMLHTTP/1.0');
var  XMLHttpFactories  =  [
        function  ()  {return  new  XMLHttpRequest()},
        function  ()  {return  new  ActiveXObject("Msxml2.XMLHTTP")},
        function  ()  {return  new  ActiveXObject("Msxml3.XMLHTTP")},
        function  ()  {return  new  ActiveXObject("Microsoft.XMLHTTP")}
];
        if  (postData)
                req.setRequestHeader('Content-­‐type','application/x-­‐www-­‐form-­‐urlencoded');
        req.onreadystatechange  =  function  ()  {
                if  (req.readyState  !=  4)  return;
                if  (req.status  !=  200  &&  req.status  !=  304)  {
                        return;
                }
                callback(req);
        }
        if  (req.readyState  ==  4)  return;
        req.send(postData);
}
function  createXMLHTTPObject()  {
        var  xmlhttp  =  false;
        for  (var  i=0;i<XMLHttpFactories.length;i++)  {
                try  {
                        xmlhttp  =  XMLHttpFactories[i]();
                }
                catch  (e)  {
                        continue;
                }
                break;
        }
        return  xmlhttp;
}