Event Keyup a-z key response

[kstubs]

Is there a clever way to ignore all other keystrokes, like arrow keys and only responsd to keycodes ranging from a-z and 0-9?  I guess another valid keystroke would be SHIFT+<a-z>.  So something like:

onKeyUp: function(e) {

  // if not valid keystroke event

  return;

  // otherwise, do the following code

}

[Victor]

Check e.keyCode. For numbers it should be in range 48...57, for letters a...z in range 97...122 (for Shift-a..z also 97...122, so you need extra check for Shift key). Other way is to use onkeypress event - it will have proper codes for a...z and A...Z, but is more browser-specific even with Prototype.