Exteranl .txt files not showing up

Here’s the deal. I have buttons that call external text to a dynamic text field and it uses CSS. I read the tutorial on here on how to do it, and it works fine when I test my site in Flash. However, when I uploaded all the files and my flash site, the text doesn’t appear. When I click a button that calls on the text, there are no errors or anything, the text just never shows up. Any ideas on what is causing this and what I can do to fix it.
Thanks