function majActivite()
{
if(document.form.SectId.value==666)
	window.open('http://www.metiersdart-puydedome.com');
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", "majActivite.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 = "secteur="+document.form.SectId.value; 
   xhr_object.send(data); 
}