If you are using Internet Explorer or FireFox: make sure you have JavaScript enabled. Then try hitting "control+R" to do a hard refresh. If that doesn't work, try clearing out all your local internet files (from the Tools menu at the top of your browser). Also, sometimes restarting your computer can help.
If you are using Safari: unfortunately, the Safari browser does not fully support all JavaScript. You have 2 options: First, try FireFox (http://www.mozilla.com/en-US/firefox/all.html) - it will work for sure. Second, try the latest version of the Safari browser (http://www.apple.com/safari/download/ - currently BETA version 3.0.3) - that will most likely solve the problem.
Please let us know if you still need help!
i cant get chessbord working