function guestbook_onPostAdmin(form, action)
{
    var post_id = form.gb_admin_post_id.value;
    
    switch (action)
    {
        case "modify":
            form.gb_admin_action.value = action;
            form.submit();
            break;
            
        case "delete":
            if (confirm("Diesen Beitrag wirklich löschen?"))
            {
                form.gb_admin_action.value = action;
                form.submit();
            }
            break;
    }
}