Hotkey is a project mainly written in JavaScript, it's free.
Javascript Hotkey Plugin eases adding keyboard navigation to your web pages.
Narsimham's Hotkey Plugin
Detect and take action when a key is pressed. To add hotkeys to your page, modify the keyPressed function below as needed.
Tested (and working) in IE 8.0, Firefox 3.5, Chrome 4.0 and Opera 10.10.
Ack: http://lotgd.net/