function vide_champ(obj) {
	if ((obj.value == "E-mail") || (obj.value == "Mot de passe")) {
		obj.value = "";
	}			
}
function rempli_champ(obj) {
	if (obj.value == "") {
		if (obj.name == "login") {
			obj.value = "E-mail";
		}
		if (obj.name == "password") {
			obj.value = "Mot de passe";
		}
	}	
}