function Inint_AJAX() {
   try { return new ActiveXObject("Msxml2.XMLHTTP");  } catch(e) {} //IE
   try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {} //IE
   try { return new XMLHttpRequest();          } catch(e) {} //Native Javascript
   alert("XMLHttpRequest not supported");
   return null;
};

function dochange2(src, val, test1, test2) {
     var req2 = Inint_AJAX();
     
     
     req2.onreadystatechange = function () { 
          if (req2.readyState==4) {
               
               if (req2.status==200) {
                    if(src=="zonax"){
                    }else{
                    document.getElementById(src).innerHTML=req2.responseText; //retuen value
                  }  
               } 
          }
     };
     req2.open("GET", "stato2_semplice.php?data="+src+"&val="+val+"&test1="+test1+"&test2="+test2); //make connection
     req2.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=iso-8859-1"); // set Header
     req2.send(null); //send value

}