function createREQ() {
   try {
      req = new XMLHttpRequest();
   } catch(err1) {
      try {
         req = new ActiveXObject('Msxml2.XMLHTTP');
      } catch (err2) {
         try {
            req = new ActiveXObject('Microsoft.XMLHTTP');
         } catch(err3) {
            req = false;
         }
      }
   }
   return req;
}

function requestGET(url,query,req) {
   myRand = parseInt(Math.random()*99999999);
   req.open("GET", url + '?' + query + '&rand=' + myRand, true);
   req.send(null);
}

function requestPOST(url,query,req) {
   req.open("POST", url, true);
   req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
   req.send(query);
}

function doCallback(callback, item) {
   eval(callback + '(item)');
}

function doAjax(url, query, callback, reqtype, getxml) {
   var myreq = createREQ();
   myreq.onreadystatechange = function() {
      if (myreq.readyState == 4) {
         if (myreq.status == 200) {
            var item = myreq.responseText;
            if (getxml == 1) {
               item = myreq.responseXML;
            }
            doCallback(callback, item);
         }
         else
            alert("Call back fault: " + myreq.status);
      }
   }
   if (reqtype == 'post') {
      requestPOST(url,query,myreq);
   }
   else {
      requestGET(url,query,myreq);
   }
}