function IsValidEmail(s){
	if(s == "") return false;
	var at = s.indexOf('@');
	if(at == -1) return false;
	if(at != s.lastIndexOf('@')) return false;
	var dot = s.indexOf('.', at+2);
	if(dot == -1) return false;
	if(dot != s.lastIndexOf('.')) return false;
	if(s.charAt(0) == '.' || s.charAt(s.Length-1) == '.' || s.charAt(at-1) == '.') return false;
	
	return true;
}

function Verif(){	
	if(document.form.email.value == ""){
		alert("Veuillez indiquer votre email.");
		document.form.email.focus();
		return;
	}
	
	if(!IsValidEmail(document.form.email.value)){
		alert("Email invalide.");
		document.form.email.focus();
		return;
	}
  	
	document.form.submit();
}