Change webiste - 2 problems

Problem 1: I have a website [login to view URL] that is working with cms. It´s working good, but it´s not really SEO friendly. For example the pagenames are like [login to view URL];nav_id=38&cat_id=124. This is for google very unfriendly. I can change evere page in cms and i want that this can be changed too in normal title soo google can read this. Furthermore i want a banner that can be changed in cms system. Problem 2: I have a site [login to view URL] with pr 4 and another one [login to view URL] with pr 5, but the PR 4 is higher. How does this come. I need advice?