function testmail(form){
	d = document;
	err = false;
	verifMail = /^[a-zA-Z0-9_.-]+@[a-zA-Z0-9.-]{2,}[.][a-zA-Z]{2,3}$/
	var reg=new RegExp("(_)", "g");

	if(verifMail.exec(d.getElementById('mail_newsletter').value) == null){
		alert("l'adresse email est invalide");
		err = true;
	}else
		d.forms[form].action = 'index.php';
	
	return !err;

}