function autocharge(lstpresttok,ref)
{
	var xhr_object = null;     
	 if(window.XMLHttpRequest) // Firefox   
      xhr_object = new XMLHttpRequest();   
    else if(window.ActiveXObject) // Internet Explorer   
       xhr_object = new ActiveXObject("Microsoft.XMLHTTP");   
    else { // XMLHttpRequest non supporté par le navigateur   
       alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest...");   
       return;   
    }   

    xhr_object.open("POST", "xmlhttprequest.php", true);   
    xhr_object.onreadystatechange = function() {   
       if(xhr_object.readyState == 4)   
          eval(xhr_object.responseText);   
    }   
    xhr_object.setRequestHeader("Content-type", "application/x-www-form-urlencoded");   
	var data = "lstpresttok="+lstpresttok+"&ref="+ref;   
	xhr_object.send(data);  

}