function call_ajax(methode)
{
   var xhr; 
    try { xhr = new XMLHttpRequest(); }                 
    catch(e) 
    {    
      xhr = new ActiveXObject('Microsoft.XMLHTTP');
    }
    xhr.onreadystatechange  = function()
    { 
         if(xhr.readyState  == 4)
         {
              if(xhr.status==200)
			  {
					window.alert(xhr.responseText);
			  }
         }
    }; 
   xhr.open('GET', methode,  true); 
   xhr.send(null); 
}