[galaxy-dev] removing "Select All" / "Unselect All" buttons from a set of check boxes

Hi Is there a way to remove the "Select All" and "Unselect All" buttons from a set of check boxes? - crated with: <param name="samples" type="select" display="checkboxes" multiple="true" dynamic_options="ds_samplesFromServer()"/> I have a very long list, and I don't want to encourage people to tick all boxes. Thank you very much for your help, Hans