JavaScript Sudoku!

Play or download the code for my sudoku game, it's written in JavaScript. My aim was to create a mini client which was easy to to use and supported keyboard navigation. Use the up, down, left & right keys to move around the board. I put the game together in a single session on one rainy Saturday afternoon so its a bit rough around the edges but feel free to do what ever you like with it! The code also comes with a modified version of the Gui class which just renders a none-interactive sudoku board, this could be handy for displaying available boards etc.