I have actually used Photoshop's web gallery on a website in the past. I usually just go through the whole automated process through Photoshop and then open the resulting HTML files in Dreamweaver. If you want to incorporate it into an existing page -- what I've done is just cut out the code from the Photoshop files and pasted into my existing HTML file wherever I want it.

I don't know if that answers your question -- hopefully it helps. If not, can you be more specific about what's happening? I'd be glad to help.

Cheers,
Shannon