my custom header code in admin is incompleted, and has caused my layout to mess up.
i can't make any changes as whatever i do, the next page puts a really long URL in my browser, and gives me an error page this URL is too long.
i can't do anything in admin, can't restore layout to default settings, or even take question2answer down for maintence
how can i change the custom header / restore the previous before this happened?