function makeRequest(url, target, showloading) {
 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.3.0");
   } catch (e) {
      try {
       http_request = new ActiveXObject("Microsoft.XMLHTTP.3.0");
      } catch (e) {}
     }
   }
   if (!http_request) {alert('Nem sikerült XMLHTTP példányt létrehozni!');return false;}
   
	if(showloading == 1){
		window.document.getElementById(target).innerHTML = '<img id="'+target+'_loader" src="js/loading.gif" />';
	}
   
   if(target != "no-target"){
		http_request.onreadystatechange = function() { alertContents(http_request, target); };
   }
   http_request.open('GET', url, true);
   http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded;charset=ISO-8859-2");
   http_request.setRequestHeader("Transfer-Encoding","transfer-extension");
   http_request.setRequestHeader("Connection","close");
   http_request.send(null);
}

function alertContents(http_request,target) {
 if (http_request.readyState == 4) {
  if (http_request.status == 200) {
    window.document.getElementById(target).innerHTML = http_request.responseText;
	}
  }
}