function valider_formulaire(formulaire_nom) {

	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", "admin.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 = "nom=tuy&select=list2"; 
	xhr_object.send(data);
}