// JavaScript Document
function createRequestObject() { 

   var req; 

   if(window.XMLHttpRequest){ 
      // Firefox, Safari, Opera... 
      req = new XMLHttpRequest(); 
   } else if(window.ActiveXObject) { 
      // Internet Explorer 5+ 
      req = new ActiveXObject("Microsoft.XMLHTTP"); 
   } else { 
      // There is an error creating the object, 
      // just as an old browser is being used. 
      alert('Problem creating the XMLHttpRequest object'); 
   } 

   return req; 

} 

// Make the XMLHttpRequest object 
var http = createRequestObject(); 

function sendRequest(email) { 
   // Open PHP script for requests 
   http.open('get', 'controlli/controllo_form.php?email='+email); 
   http.onreadystatechange = handleResponse; 
   http.send(null);
} 

function handleResponse() { 

   if(http.readyState == 4){ 

      // Text returned FROM the PHP script 
      var response = http.responseText; 

      if(response) { 
         // UPDATE ajaxTest content 
         document.getElementById("err_email").innerHTML = response; 
      } else {
         document.getElementById("err_email").innerHTML = ''; 		  
	  }

   } 

}