def remove_holddown(form, fields):
    """This removes the unhelpful "Hold down the...." help texts for the
    specified fields for a form."""
    remove_message = unicode(_('Hold down "Control", or "Command" on a Mac, to select more than one.'))
    for field in fields:
        if field in form.base_fields:
            if form.base_fields[field].help_text:
                form.base_fields[field].help_text = form.base_fields[field].help_text.replace(remove_message, '').strip()
    return form