Form_Dropdown with Blank "Select One..." Option

[eluser]michalsn[/eluser]

Code:

$this->form_validation->set_rules('gender', 'Gender', 'required');

Code:

function get_genders()
{
    return array(
      NULL => 'Select One...',
      'male' => 'Male',
      'female' => 'Female'
    );
}

Code:

echo form_dropdown('gender', $gender_options, set_value('gender', $gender_answer));