I wondered if anyone could be so kind as to help me. Using the following code:

  echo '
10 seconds!
'; jquery_countdown_add(".countdown", array("until" => 1800, "onExpiry" => "finished")); drupal_add_js("function finished() { alert('You are done!'); }", 'inline');

I want to remove the Hour column, and I want to add a button to start the timer. I cant work out how to put this into the code.

Any help would be really greatly appreciated.