ffdn.org/sites/all/modules/feedback_simple/feedback_simple.module

<?php
/**
 * @file
 * Module file.
 */

/**
 * Implements hook_theme().
 */
function feedback_simple_theme($existing, $type, $theme, $path) {
  return array(
    'feedback_simple' => array(
      'variables' => array(
        'link' => 'contact',
        'align' => 'right',
        'class' => array('feedback_simple'),
        'top' => '75%',
        'alt' => t('feedback'),
        'image' => base_path() . drupal_get_path('module', 'feedback_simple') . '/feedback_simple.gif',
        'height' => '100',
        'width' => '35',
        'enabled' => true,
      ),
      'template' => 'feedback_simple',
    ),
  );
}

/**
 * Implements hook_preprocess_feedback_simple().
 */
function feedback_simple_preprocess_feedback_simple(&$variables) {
  // Hide the tab when on the $link page.
  if (current_path() == $variables['link']) {
    $variables['enabled'] = false;
  }
  // Allow Drupal to apply base_path and locale prefix outside of the
  // theme registry cache.
  $variables['link'] = url($variables['link']);
}

/**
 * Implements hook_page_build().
 */
function feedback_simple_page_build(&$page) {
  $page['page_bottom']['feedback_simple'] = array(
    '#type' => 'markup',
    '#markup' => theme('feedback_simple'),
    '#attached' => array(
      'css' => array(drupal_get_path('module', 'feedback_simple') . '/feedback_simple.css'),
    ),
  );
}