So it has pr 3 and pr 4 so i go on with placing links there and yes it is going to be one way links...by the way directores also have many links on their pages...
The PR of a page is shared down to all the pages it is linking too - like a pyramid of champagne glasses at a wedding! If there are 1000 glasses under 1 glass, each glass will get very little champagne overflow (aka link juice) It is better to get a link from a PR 2 site with no links than a PR 3 site with 100 links.