function couleur(obj) {
     obj.style.backgroundColor = "#FFFFFF";
}

function check() {
	var msg = "";

		if (document.formulaire.mail.value != "")	{
		indexAroba = document.formulaire.mail.value.indexOf('@');
		indexPoint = document.formulaire.mail.value.indexOf('.');
		if ((indexAroba < 0) || (indexPoint < 0))		{
		document.formulaire.mail.style.backgroundColor = "#b6015f";
			msg += "email is not valid\n";
		}
	}
	else	{
		document.formulaire.mail.style.backgroundColor = "#b6015f";
		msg += "Please insert an email.\n";
	}

if (document.formulaire.nom.value == "")	{
		msg += "Please insert an Name\n";
		document.formulaire.nom.style.backgroundColor = "#b6015f";
	}

if (document.formulaire.prenom.value == "")	{
		msg += "Please insert a First name\n";
		document.formulaire.prenom.style.backgroundColor = "#b6015f";
	}

	if (msg == "") return(true);
	else	{
		alert(msg);
		return(false);
	}
}