VP422HDTV (Vizio 42" Plasma) Image Retention..

i recently had problems with my Sony 55" Wega, so i bought a 42" plasma from Vizio. it certainly has better Contrast (30,000:1)

but ive noticed a problem when i played TES IV: Oblivion for a good amount of time... when i turned off my PS3, the blank screen showed a "ghost" of my health bars and the works...

i know this is normal (since there was an image cleaner in the settings) but this worries me of getting an official, all-out "burn in" if i play for too long!

how can i prevent this from happening and/or reduce my chances??

what ARE my chances of getting a burn in? (it leaves a vague "ghost" in around 10-20 minutes or less.)

thanks guys!!!

lordofuo