Use Drupal.behaviors instead of checkJQuery (with patch)

Hi Jake,
I modified your JS a little to use Drupal.behaviors instead of $(document).ready, it's more Drupaly that way and removes the need for the checkJQuery function as well. (See patch.)

Also fyi in case someone raises this issue, if the Tabs module is enabled, there's a bug there (#836098) that breaks gridder.

- Ben