var http_request = false; 

   function makeRequest(url) { 

       if (window.XMLHttpRequest) { // Mozilla, Safari,... 
           http_request = new XMLHttpRequest(); 
       } else if (window.ActiveXObject) { // IE 
           http_request = new ActiveXObject("Microsoft.XMLHTTP"); 
       } 
       //http_request.onreadystatechange = alertContents; 
	   http_request.onreadystatechange = alert ('Кухня добавлена в Избранное');
       http_request.open('GET', url, true); 
       http_request.send(null); 

   } 

   function alertContents() { 

       if (http_request.readyState == 4) { 
           if (http_request.status == 200) { 
               alert(http_request.responseText); 
           } else { 
               alert('There was a problem with the request.'); 
           } 
       } 

   }