Best JavaScript Guru on RentACoder

i need the best possible javascript guru to help me optimize the JS on a real-time web app we have developed for online gaming. we currently use a few public libraries (scriptaculous, prototype, and extjs). the project we are working is a lot like [login to view URL] (windows, chat, etc). this bid is for 8 hours of your time. you MUST be able to show some portfolio work. thank you!