drop down menus

I'm building a site using FP 2002,:( and so use html scripting to insert a drop menu list. The pages are currently hosted on an internal server. When I use the form in the browser, any address with an http:www.dfakf address works, but the address for the internal one is http://mail.wfjadkl and that dosen't function.

Does this make sense to anyone and can you help me? Is it server configuration? or something else?
Thanks very much,
Mary G.