Improvements in Inner Pages

[learning_seo]

Hello People,

I have a environment related site globalwarming-prevention(dot)com. Though this site has home page pr 3, all its categories and sub-category pages has PR 0. Even after doing on page optimization and off page work it doesn't get PR.

Will you please tell me what more improvements I need to do . Should each category and sub category pages contain images ?

Regards

[Scootek]

How deep are these pages? Have some of the pages that you are trying to optimise got links from the home page? Have you tried getting/building links to those pages? I have never worried about the PR on pages. I know it helps. All I want is for those pages to rank highly for traffic, so if I had a page dedicated to "computer part in london" then, so long as it came on page one for related keywords then I don't worry too much. PR is always a bonus. I appreciate there is a relation.