Linking of passwords between different PHP on a site to share one login

Avg Bid (USD)
Project Budget (USD)
$300 - $1000

Project Description:
1. I have a website that's 2/3 finish. Its has pligg php, oscommerce php, smartmachines php and osclass classified ads php. The main page/site is done in html. What i need is for there to be one password between them. what that means it, that if you log into to pligg, you are also logged into the other portion of my site.
2. tweaking. I need the pligg to operate/feel/look like a popular social networking media not a copy just the basic functionality. and some tweaking needs to be done on the osclass aswell. and some other basic tweaking/adding like home buttons and what not.
3. Basics complete of the site overall aesthetics.(will provide details)

Basically i just need a bunch of tweaking done. :)

Skills required:
CSS, Graphic Design, HTML, PHP, Software Architecture
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