var errfound = false;

function error(elem, text) {
	if (errfound) return;
	window.alert(text);
	elem.select();
	elem.focus();
	errfound = true;
}

function loginCheck(f) {

	errfound = false;

	if (f.Courriel.value == "")
		error(f.Courriel,"Courriel ? - Email ? ");
	
  	return ! errfound;
}