Remove the "Please wait" text on Ajax Call
You should be able to do this with hook_form_alter() by changing the Ajax settings that control the form's Ajax. There is a 'progress' property in Ajax that will allow you to set or change the 'Please wait...' text. From the API docs:

#ajax['progress']['message'] String. An optional message to the user; should be wrapped with t().


A sample hook_form_alter() that will accomplish this:

function mymodule_form_FORM_ID_alter($form, &amp;$form_state) {
  unset($form['element']['#ajax']['progress']['message']);
  // or:
  $form['element']['#ajax']['progress']['message'] = '';
}


You should be able to use print_r($form); or dsm($form) (with Devel module) to locate the form element with Ajax properties set. Use that to locate the proper element and replace my $form['element'] above with the actual element in question.