How to set an external file for the url?

Friends,

I am having six pages. each page is having one flash file. each flash file is having 5 url’s.
i have frequently keep changing the url’s.
currently what im doing is…
manually editing the flash file each time.
instead of that if i type an url in a text file. so that i can call this text file in side the flash.
but how can i do that?

Thanks
Sathyguy