diff -Naur ../htmlpurifier/htmlpurifier.module htmlpurifier/htmlpurifier.module
--- ../htmlpurifier/htmlpurifier.module	2010-04-27 14:55:13.000000000 -0500
+++ htmlpurifier/htmlpurifier.module	2010-04-27 15:08:31.000000000 -0500
@@ -34,35 +34,43 @@
   $version = trim($result->data);
   variable_set('htmlpurifier_version_current', $version);
 }
-
 /**
- * Implementation of hook_init().
+ * Implementation of hook_requirements().
  * @note
  *    Displays any need to update the HTML Purifier library.
  */
-function htmlpurifier_init() {
-  if (user_access('access administration pages')) {
-    $current = variable_get('htmlpurifier_version_current', FALSE);
-    if (!$current) {
-      htmlpurifier_cron();
+function htmlpurifier_requirements($phase) {
+  $requirements = array();
+  switch ($phase) {
+    // Check at runtime
+    case 'runtime':
       $current = variable_get('htmlpurifier_version_current', FALSE);
-    }
-    $ours = variable_get('htmlpurifier_version_ours', FALSE);
-    if (!$ours || version_compare($current, $ours, '>')) {
-      // Update our version number if it can't be found, or there's a mismatch.
-      _htmlpurifier_load();
+      if (!$current) {
+        htmlpurifier_cron();
+        $current = variable_get('htmlpurifier_version_current', FALSE);
+      }
       $ours = variable_get('htmlpurifier_version_ours', FALSE);
-    }
-    if ($current && $ours && version_compare($current, $ours, '>')) {
-      drupal_set_message(
-        t('Your version of HTML Purifier is currently out of date; '.
-        'the most recent version is %version. You can download the latest '.
-        'version at <a href="http://htmlpurifier.org">htmlpurifier.org</a>. '.
-        'To update, place the contents of HTML Purifier\'s <code>library/</code> folder in '.
-        '<code>modules/htmlpurifier/library/</code>.',
-        array('%version' => $current)), 'warning', FALSE);
-    }
+      if (!$ours || version_compare($current, $ours, '>')) {
+        // Update our version number if it can't be found, or there's a mismatch.
+        _htmlpurifier_load();
+        $ours = variable_get('htmlpurifier_version_ours', FALSE);
+      }
+      if ($current && $ours && version_compare($current, $ours, '>')) {
+        $requirements['htmlpurifier_library'] = array(
+          'title' => t('HTML Purifier Library'),
+          'value' => t('The library is out of date'),
+          'description' => t('Your version of HTML Purifier is currently out of date; '.
+            'the most recent version is %version. You can download the latest '.
+            'version at <a href="http://htmlpurifier.org">htmlpurifier.org</a>. '.
+            'To update, place the contents of HTML Purifier\'s <code>library/</code> folder in '.
+            '<code>modules/htmlpurifier/library/</code>.',
+            array('%version' => $current)),
+          'severity' => REQUIREMENT_WARNING,
+        );
+      }
+      break;
   }
+  return $requirements;
 }
 
 /**