I would suggest you might start with the permanent How-To and FAQ postings, they contain links to this issue and other typical issues. Very good material.
NEW Users - openSuse Pre-install (general) – PLEASE READ - openSUSE Forums
openSUSE 11.2 | SUSE Linux | Beginner’s guide multimedia MP3 DVD codecs 3D nvidia ati wireless wlan wifi rpm kde howto
and
Multi-media and Restricted Format Installation Guide - openSUSE Forums
Possibly some other links as well. I recall seeing at least two guide that helped get my Flash working. The first one didn’t (for me), the 2nd one did the trick.