Did you go to edit? Just type in 200 on the right hand side and leave the left hand side at whatever it is at, unless it is above 500. That pic would be better for an avatar, though, because it will be squished at 500 x 200 =)
Pretty cool idea, dude, you can actually go ahead and do that in the video game section if you want =) Make it the 2011 TRMK Video Game Awards! You can change the title if you want, just my idea for a title, lol.