var http_request = false;
   var id_result;
   function makePOSTRequest(url,id) {
	   var  parameters='';
      http_request = false;
	 id_result=id;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
         	// set type accordingly to anticipated content type
            //http_request.overrideMimeType('text/xml');
            http_request.overrideMimeType('text/html');
         }
      } 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('Cannot create XMLHTTP instance');
         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.setRequestHeader("Connection", "close");
      http_request.send(parameters);
   }

   function alertContents() {
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            result = http_request.responseText;
            document.getElementById(id_result).innerHTML = result;  
         } 
		 else {
            alert('There was a problem with the request.');
			
         }
		
      }
	  else 
		document.getElementById(id_result).innerHTML = '<center><img src="/images/processing.gif"><br>Đang xử lý...<center>';
   }
   
   
   function onof(idon,idoff)
   {
	document.getElementById(idon).style.display='';   
	document.getElementById(idoff).style.display='none';   
	   
   }