Senior Javascript Browser Developer

Looking for a developer with advanced cross-browser javascript/DOM skills to work closely with an agile team developing and advanced client side javascript application. The candidate should have a strong familiarity with using javascript as a true prototype based OO language. The product is a client side tool that needs to work well in both Internet Explorer and Firefox. The candidate will have demonstrated experience with XPath, Ranges, and the event and box model differences between Firefox and Internet Explorer.