var http_request = false;
   function isnrequest(url, parameters,ret) {
      http_request = false;
      if (window.XMLHttpRequest) { // for Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
            http_request.overrideMimeType('text/html');
         }
      } else if (window.ActiveXObject) { // for all IEs
         try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request) {
         alert('cannot do a ajax submit!');
         return false;
      }
      http_request.onreadystatechange = alertContents(ret);
      http_request.open('GET', url + parameters, true);
      http_request.send(null);
   }
function alertContents(ret) {
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            result = http_request.responseText;
            document.getElementById(ret).innerHTML = result;            
         } else {
            alert('There was a problem with the request.');
         }
      }
   }