var http_request = false;
   function makePOSTRequest(url, parameters) {
      http_request = false;
      if (window.XMLHttpRequest) {
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
            http_request.overrideMimeType('text/html');
         }
      } else if (window.ActiveXObject) {
         try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request) {
         alert('Nie można stworzyć instancji XMLHTTP.');
         return false;
      }
      
      http_request.onreadystatechange = alertContents;
      http_request.open('POST', url, true);
      http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      http_request.setRequestHeader("Content-length", parameters.length);
      http_request.send(parameters);
   }

   function alertContents() {
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            //alert(http_request.responseText);
            result = http_request.responseText;
            document.getElementById('tlocien').style.background='#FFFFFF url(images/menutlo.png) repeat-y top left';
			document.getElementById('glowny').innerHTML = result;            
         } else {
            alert('Wystąpił problem z realizacją żądania.');
         }
      }
   }
   

   function ajaxgo(dane) {
      document.getElementById('tlocien').style.background='none';
      document.getElementById('glowny').innerHTML = '<div id="load"><img src="images/ajax.gif" alt="" /> Proszę czekać...</div>';
      makePOSTRequest('ajax.php', dane);
   }