var xhr = null; 
function getXhr()
{
     if(window.XMLHttpRequest)xhr = new XMLHttpRequest(); 
else if(window.ActiveXObject)
  { 
  try{
     xhr = new ActiveXObject("Msxml2.XMLHTTP");
     } catch (e) 
     {
     xhr = new ActiveXObject("Microsoft.XMLHTTP");
     }
  }
else 
  {
  alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); 
  xhr = false; 
  } 
}


function ShowPage(nb)
{

var key = document.getElementById("code").value.length;
if (key === 7){
var tz = document.getElementById("time_zone").value;
var cript = document.getElementById("code").value;
document.getElementById("result").innerHTML= '<img src="http://www.meteo-mc.fr/Images/load2.gif">';

getXhr();
xhr.onreadystatechange = function()
    {
     if(xhr.readyState == 4 && xhr.status == 200)
     {
     document.getElementById("result").innerHTML= xhr.responseText;  
     }
    }
xhr.open("GET","ajax.php?nb="+nb+"&cript="+cript+"&tz="+tz,true);

xhr.send(null);
}
}