function add_to_workout()
{
  document.getElementById('addmessage').innerHTML = 'Working...  <img src="' + imgurl + '/loadingAnimation.gif" />';
  cp.call('ajax/add_to_workout.php', 'add_to_workout', handle_workout_result, document.getElementById('newworkout').value,
          document.getElementsByName('existingworkout').item(0).value,
          document.getElementById('hiddenviewkey').value);
  // Return false so that the add-to-workout form doesn't reload the page (I guess)
  return false;
}

function handle_workout_result(result)
{
  var server_result;
  server_result = result.getElementsByTagName('add_result').item(0).firstChild.nodeValue;
  document.getElementById('addmessage').innerHTML = server_result;
}