--- textsize.module.old	2009-03-12 10:55:10.000000000 -0400
+++ textsize.module	2009-03-12 10:51:03.000000000 -0400
@@ -323,4 +323,8 @@ function textsize_init() {
  * Uncomment example:
  *   drupal_add_js(drupal_get_path('module', 'textsize') .'/jquery.cookie.js');
  */
-jquery_plugin_add('cookie');
+if (function_exists('jquery_plugin_add')) {
+  jquery_plugin_add('cookie');
+} else {
+  drupal_set_message(t('Drupal\'s jQuery Plugin Module Required for textsize functionality'));  
+}