function Controle()

{

if(document.plaquette.Nom.value=='') // 1

{

alert('You have to fill your name');

document.plaquette.Nom.focus();

}

else if(document.plaquette.Prenom.value=='') // 2

{

alert('You have to fill your first name');

document.plaquette.Prenom.focus();


}

else if(document.plaquette.Email.value=='') // 2

{

alert('You have to fill your e-mail');

document.plaquette.Email.focus();

}

else

{

document.plaquette.method = "POST";

document.plaquette.action = "envoi.php";

document.plaquette.submit();

}

}