function valider(frm,champs,lib_champs){
	 for (var i = 0; i < champs.length; i++) {
		 var nom_champ=champs[i];
		 var lib=lib_champs[i];
		 if (frm.elements[nom_champ].value == "") {
			alert("Saisissez "+lib);
			frm.elements[nom_champ].focus();
			return false;
		}
	 }
	return true;
 }
 
 function check_liste(frm,champs,lib_champs) {
	 for (var i = 0; i < champs.length; i++) {
		 var nom=champs[i];
		 var lib=lib_champs[i];
		 if (frm.elements[nom].value == 0) {
			alert("Choisissez "+lib);
			frm.elements[nom].focus();
			return false;
		}
	 }
	return true;
 }