function emailvalide(adresse)
{
	var str = new String(adresse);
	var point = str.lastIndexOf('.');
	var arobase = str.lastIndexOf('@');
	var espace = str.indexOf(' ');
	var lgtotal = str.length;
	
	if( (lgtotal-point <3) || point == -1 || arobase == -1 || espace != -1 || point < arobase || (point-arobase <=1))
		return false;
	else return true;
}

function verif_newsletter()
{
	news = document.getElementById('form_news_email');	

	if (emailvalide(news.value))
		return true;
	else
	{
		alert("L'email que vous avez entrée est incorrecte.");
		news.select();
		return false;
	}
}