Fonction "retour" universelle

retour = function()
{
    if (document.referrer && document.referrer.indexOf('mondomaine.fr')>=0)
    {
        history.go(-1);
        setTimeout(function()
        {
            location.href = document.referrer;
        },500);
    }
    else
    {
        window.location.href = 'mapage.php';
    }
}