function ajax(fichier) {
	if(window.XMLHttpRequest) // FIREFOX
	  xhr_object = new XMLHttpRequest();
	else if(window.ActiveXObject) // IE
	  xhr_object = new ActiveXObject("Microsoft.XMLHTTP");
	else
	  return(false);
	xhr_object.open("GET", fichier, false);
	xhr_object.send(null);
	if(xhr_object.readyState == 4) return(xhr_object.responseText);
	else return(false);
}