Pushin' the Page Rank

I have a pretty good knowledge of how Page Rank works, and the dos and donts of increasing it, but one thing I haven't mastered is how to focus one's page rank onto a particular page, when a site uses extensive interlinking. If a site has a nav bar at top of every page. with links to every other page in the site, how can that be shaped into a situation where PR is flowing into one particular page? Our site has a PR of 6 for the home page, and a few 4's, sometimes a 3, on interior pages. I would like to direct the PR from those 4's and 3's to the home page, which is where it would do most good. (we're playing against sites with PR of 7 or 8 on homepage). Are there ways to do this, given the extreme interlinking on the site?

If the only external links are towards the homepage, no internal linking structure will increase that page's PR. You get assigned a finite amount and the only way to increase it is by getting more and better external links.

What could help you, however, is if all your internal pages have a link back to the homepage using your main keyword(s) as the anchor text. It won't help your PR but it will help your rankings for those keywords.

Gringo.