Create html text editor Form API

configure.php

  $form[ConfigureNode::BANNER_TOP_CF."_text"] = array(
    '#type'          => 'text_format',
    '#title'         => t('Banner Description'),
    '#rows'          => 5,
    '#resizable'     => FALSE,
    '#default_value' => variable_get(ConfigureNode::BANNER_TOP_CF."_text", ""),
    '#format'        => 'full_html'
  );