function tip_style(id) {
	var o = document.getElementById("tip");
	switch(o.style.backgroundColor) {
		case "white":
			o.style.backgroundColor = "yellow";
			break;
		case "yellow":
			o.style.backgroundColor = "white";
			break;
	}
}

function f_valid_card(oForm) {
	if((oForm.email.value!='')&&(oForm.nom.value!='')&&(oForm.emaildest.value!='')&&(oForm.message.value!='')) {
		return oForm.submit();
	}
	else {
		return alert('Votre message est incomplet.\nIl n\'a pu être envoyé.');
	}
}