diff --git jquery_ui.module jquery_ui.module
index 0ae9fd9..6a8cf6d 100644
--- jquery_ui.module
+++ jquery_ui.module
@@ -11,20 +11,6 @@
  */
 
 /**
- * Path to jQuery UI library.
- *
- * During site installation, JQUERY_UI_PATH is the absolute path to the
- * jQuery UI library.  At all other times JQUERY_UI_PATH is relative, and
- * safe for use in URLs.
- */
-if (defined('MAINTENANCE_MODE') && MAINTENANCE_MODE == 'install') {
-  define('JQUERY_UI_PATH', dirname(__FILE__) . '/jquery.ui');
-}
-else {
-  define('JQUERY_UI_PATH', drupal_get_path('module', 'jquery_ui') . '/jquery.ui');
-}
-
-/**
  * Add the specified jQuery UI library files to this page.
  *
  * The ui.core file is always included automatically, as well as the
@@ -36,7 +22,7 @@ else {
  */
 function jquery_ui_add($files = array()) {
   static $loaded_files, $ui_core, $effects_core;
-  $jquery_ui_path = JQUERY_UI_PATH . '/ui';
+  $jquery_ui_path = jquery_ui_get_path() . '/ui';
   $compression = variable_get('jquery_update_compression_type', 'mini');
 
   // Convert file to an array if it's not one already, to compensate for
@@ -88,10 +74,37 @@ function jquery_ui_add($files = array()) {
 function jquery_ui_get_version() {
   $version = 0;
 
-  if (file_exists(JQUERY_UI_PATH . '/version.txt')) {
-    $version = file_get_contents(JQUERY_UI_PATH . '/version.txt');
+  $version_file = jquery_ui_get_path() . '/version.txt';
+  if (file_exists($version_file)) {
+    $version = file_get_contents($version_file);
   }
 
   return $version;
 }
 
+/**
+ * Return the path of installed jQuery UI.
+ */
+function jquery_ui_get_path() {
+  static $jquery_ui_path;
+
+  if (isset($jquery_ui_path)) {
+    return $jquery_ui_path;
+  }
+
+  // check first for the standard default libraries directory
+  // then for any other libraries directory
+  // and finally for the in jquery ui module directory
+  $static_libraries = 'sites/all/libraries/jquery.ui';
+  if (file_exists($static_libraries) && is_dir($static_libraries)) {
+    $jquery_ui_path = $static_libraries;
+  }
+  elseif (function_exists('libraries_get_path')) {
+    $jquery_ui_path = libraries_get_path('jquery.ui');
+  }
+  else {
+    $jquery_ui_path = drupal_get_path('module', 'jquery_ui') . '/jquery.ui';
+  }
+
+  return $jquery_ui_path;
+}