function createRequestObject() {

    var ro;

    var browser = navigator.appName;

    if(browser == "Microsoft Internet Explorer"){

        ro = new ActiveXObject("Microsoft.XMLHTTP");

    }else{

        ro = new XMLHttpRequest();

    }

    return ro;

}





function makeHttpRequest(url, callback_function, callback_waiting_function, return_xml)

{

   var http_request = false;



   if (window.XMLHttpRequest) { // Mozilla, Safari,...

       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('Unfortunatelly you browser doesn\'t support this feature.');

       return false;

   }

   http_request.onreadystatechange = function() {

       if (http_request.readyState == 4) {

           if (http_request.status == 200) {

               if (return_xml) {

                   eval(callback_function + '(http_request.responseXML)');

               } else {

                   eval(callback_function + '(http_request.responseText)');

               }

           } else {

               alert('There was a problem with the request.(Code: ' + http_request.status + ')');

           }

       } else if (http_request.readyState < 4) {

       eval(callback_waiting_function + '()');

       }

   }

   http_request.open('GET', url, true);

   http_request.send(null);

}