// AJAX

function makeHttpRequest(url, callback_function, return_xml,getORpost,postParameters) {
   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 {
                document.write(http_request.responseText);
               //alert('There was a problem with the request.(Code: ' + http_request.status + ') and '+http_request.responseText+'');
           }
       }
   }

    if(getORpost == "get") {
       http_request.open('GET', url, true);
       http_request.send(null);
    }
    else if(getORpost == "post") {
        http_request.open('POST', url, true);
        http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
        http_request.setRequestHeader("Content-length", postParameters.length);
        http_request.setRequestHeader("Connection", "close");
        http_request.send(postParameters);
    }

}