function checkForm() 
{
	form = document.forms['formMail'];
	if( form )
	{
		if (form.nom.value == "" || form.prenom.value == "" || form.mail.value == "" )
		{
			document.getElementById("msg").style.display = "";
			document.getElementById("msg").innerHTML = "Renseignez tous les champs";
			return false;
		} 
		
		if( ! checkMail( form.mail.value ) )
		{
			document.getElementById("msg").style.display = "";
			document.getElementById("msg").innerHTML = "Adresse email incorrecte.";
			return false;
		}  
	}
	return true;
}
function checkMail( mail )
{
	ctl = /^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+([\.][a-z0-9-]+)+$/;
	return ( mail.search(ctl) != -1 );
}