Linda hit the nail on the head. And there are a few other things that effect PR on internal pages.
database sites usualy have a bunch of question marks and other symbols and punctuation in the file name, and pr is not easily built to these types of file extentions.
Then you also have internal link structure. If you do not have proper internal linking, you can not share PR with internal pages. and you can actualy gain PR on internal pages with proper internal link structure.
Your site should basicaly be set up like this forum.
Main page with links to catagories, then sub cats, and then down another level from there.
Kinda like a tree. understand?
And again, like Linda said, get some internal links.
And every page should link back to the home page.
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