plasma return?

[dipset420]

i was just wondering this. if i bought a plasma and the image burned into the screen, can you return it to the store for a new one if you have a warranty?

and 2 other things about a plasma.

1. how long does a image have to stay on the screen for burn in and can you play video games on a plasma and not have to worry.

2. how long does plasma last and when they do die what do you need to replace? a whole tv a light bulb or something else