function verifievide(objchamp,nbchar)
{
	var strchaine;
	strchaine = objchamp.value;
	if (strchaine.length < nbchar)
	{
		alert(''+ objchamp.name +' obligatoire.');
		objchamp.value='';
		objchamp.focus();
		return false;
	}
	else
	{
		return true;
	}
}
function verifiemail(objchamp)
{
	varemail = objchamp.value;
	ret = varemail.indexOf("@");
	if (ret != -1)
	{
		ret = (varemail.indexOf(".",ret) != -1);
		if (ret)
		{
			return true;
		}
	}
	alert('Adresse email invalide.');
	objchamp.focus();
	return false;
}
function verifall()
{
	coderet = false;
	coderet = verifiemail(document.formu.Email);
 	if (coderet) { coderet = verifievide(document.formu.Nom,3) };
 	if (coderet) { coderet = verifievide(document.formu.Prenom,3) };

	return coderet;
}