I am trying to create a sitemap for my new site. I have used a couple of online generators such as http://www.xml-sitemaps.com/ . The problem is they only find 1 page. I have less than 20 pages on the site, but it won't find any other pages besides the address I enter.

maybe your navigation doesn't allow the "tool" to find any more pages.

I think that. Yo need to recheck your script. What is the main principle of that? I think that your script for sitemap need to be rechecked.

Agree to helicopter.. find time to take a look at your script and see if there are some errors..

Are your pages linked from your homepage? Maybe this could be problem...

Yeah. That could be the most probable reason. Check whether all the pages are linked to the home page either directly or indirectly. There should not be any orphaned pages in your site.