function showLayer() {
	for (var i=0; i<showLayer.arguments.length; i++) {
		var element = document.getElementById(showLayer.arguments[i]);
		element.style.display = (element.style.display == "block") ? "none" : "block";
	}
}

      function verif(email) { // Email valide ?
         var arobase = email.indexOf("@")
         var point = email.lastIndexOf(".")
         if((arobase < 3)||(point + 2 > email.length)
            ||(point < arobase+3)) return false
         return true
         } 
				 
      function test(mail,nom,prenom) { // V†rifie le formulaire
		if(nom.value=="") { alert('Nom requis !')
            nom.focus();return false }	
        if(prenom.value=="") { alert('Prenom requis !')
            prenom.focus();return false }
		if(!verif(mail.value)) { alert('Email invalide !')
            mail.focus();return false }
		return true // envoie les champs
         }