WA doesn't recognize table headings

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Open a page containing a table
2. Press Ctrl+D or Ctrl+R to navigate the table from a <th> element
3.

What is the expected output? What do you see instead?
WA will respond with 'not in a table'.  It should respond to the key press and 
move to another cell.

Please use labels and text to provide additional information.

Original issue reported on code.google.com by [email protected] on 8 Jul 2010 at 3:42