diff --git a/classes/ComicPressDBInterface.inc b/classes/ComicPressDBInterface.inc
new file mode 100644
index 0000000..3ab5f20
--- /dev/null
+++ b/classes/ComicPressDBInterface.inc
@@ -0,0 +1,97 @@
+<?php
+
+class ComicPressDBInterface {
+  var $_non_comic_categories, $_all_categories;
+
+  function ComicPressDBInterface() {}
+  
+  function get_instance() {
+    static $instance;
+    
+    if (!isset($instance)) {
+      $instance = new ComicPressDBInterface();
+    }
+    return $instance;
+  }
+  
+  function set_comic_categories($categories) {
+    $this->_non_comic_categories = array();
+    $this->_all_categories       = array();
+    foreach (get_categories("hide_empty=0") as $category_object) {
+      $this->_all_categories[] = $category_object->term_id;
+      if (!in_array($category_object->term_id, $categories
+      $this->categories_by_id[$category_object->term_id] = $category_object;
+    }
+    
+    $this->_categories = $categories;
+  }
+  
+  /**
+   * Find the terminal post in a specific category.
+   */
+  function get_terminal_post_in_category($category_id, $first = true) {
+    $sort_order = $first ? "asc" : "desc";
+    $terminal_comic_query = new WP_Query();
+    $terminal_comic_query->query("showposts=1&order=${sort_order}&cat=${category_id}&status=publish");
+    if ($terminal_comic_query->have_posts()) {
+      return reset($terminal_comic_query->posts);
+    }
+    return false;
+  }
+  
+  /**
+   * Get the first comic in a category.
+   */
+  function get_first_comic($category_id) {
+    return $this->get_terminal_post_in_category($category_id);
+  }
+  
+  /**
+   * Get the last comic in a category.
+   */
+  function get_last_comic($category_id) {
+    return $this->get_terminal_post_in_category($category_id, false);  
+  }
+
+  /**
+   * Get the comic post adjacent to the current comic.
+   */
+  function get_adjacent_comic($category, $next = false, $override_post = null) {
+    global $wp_query, $post;
+    $temp = $wp_query->is_single;
+    $wp_query->is_single = true;
+    
+    if (!is_null($override_post)) {
+      $temp_post = $post;
+      $post = $override_post; 
+    }
+    
+    $categories_to_exclude = $this->get_leaves_of_tree($this->non_comic_categories);
+    if (!is_null($category)) {
+      $categories_to_exclude = $this->exclude_all_but_provided_categories($category);
+    }
+    
+    $result = get_adjacent_post(false, implode(" and ", $categories_to_exclude), !$next);
+
+    $wp_query->is_single = $temp;
+    
+    if (!is_null($override_post)) {
+      $post = $temp_post; 
+    }
+
+    return empty($result) ? false : $result;
+  }
+  
+  /**
+   * Get the previous comic from the current one.
+   */
+  function get_previous_comic($category = null, $override_post = null) { return $this->get_adjacent_comic($category, false, $override_post); }
+
+  /**
+   * Get the next comic from the current one.
+   */
+  function get_next_comic($category = null, $override_post = null) { return $this->get_adjacent_comic($category, true, $override_post); }
+  
+}
+
+?>
\ No newline at end of file
diff --git a/classes/ComicPressFilters.inc b/classes/ComicPressFilters.inc
new file mode 100644
index 0000000..423f52d
--- /dev/null
+++ b/classes/ComicPressFilters.inc
@@ -0,0 +1,17 @@
+<?php
+
+class ComicPressFilters {
+  function comicpress_display_attached_images($images, $post_id, $content) {
+    return array($images, $post_id, implode("\n", $images));
+  }
+}
+
+$__comicpress_filters = new ComicPressFilters();
+
+foreach (array(
+  'comicpress_display_attached_images' => 3
+) as $filter => $param_count) {
+  add_filter($filter, array(&$__comicpress_filters, $filter), 10, $param_count);
+}
+
+?>
\ No newline at end of file