/********************************************************************************************/
/* AHAH functions by Phil Ballard                                                           */
/* This code is intended for study purposes.                                                */
/* You may use these functions as you wish, for commercial or non-commercial applications,  */
/* but please note that the author offers no guarantees to their usefulness, suitability or */
/* correctness, and accepts no liability for any losses caused by their use.                */
/********************************************************************************************/

function callAHAH(url, pageElement, callMessage, errorMessage) {
     document.getElementById(pageElement).innerHTML = callMessage;
     try {
     req = new XMLHttpRequest(); /* e.g. Firefox */
     } catch(e) {
       try {
       req = new ActiveXObject("Msxml2.XMLHTTP");  /* some versions IE */
       } catch (e) {
         try {
         req = new ActiveXObject("Microsoft.XMLHTTP");  /* some versions IE */
         } catch (E) {
          req = false;
         } 
       } 
     }
     req.onreadystatechange = function() {responseAHAH( pageElement, errorMessage );};
     req.open("GET",url,true);
     req.send(null);
  }
  
var req = false;
   function inviaPOST( url, parameters, pageElement, callMessage, errorMessage ) {
      req = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         req = new XMLHttpRequest();
         if (req.overrideMimeType) {
            req.overrideMimeType('text/xml');
         }
      } else if (window.ActiveXObject) { // IE
         try {
            req = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               req = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!req) {
         alert('Non è possibile creare un\'istanza XMLHTTP!');
         return false;
	  }

      req.onreadystatechange = function() {responseAHAH( pageElement, errorMessage );};
      req.open('POST', url, true);
      req.setRequestHeader( "Content-type", "application/x-www-form-urlencoded" );
      req.setRequestHeader( "Connection", "close" );
      req.send( parameters );
   }

function responseAHAH( pageElement, errorMessage ) {
   var output = '';
   if(req.readyState == 4) {
      if(req.status == 200) {
         output = req.responseText;
         document.getElementById(pageElement).innerHTML = output;
         } else {
         document.getElementById(pageElement).innerHTML = errorMessage+"\n"+output;
         }
      }
  }