diff --git a/3.0/modules/displaytags/helpers/displaytags_event.php b/3.0/modules/displaytags/helpers/displaytags_event.php
new file mode 100644
index 00000000..7b92685e
--- /dev/null
+++ b/3.0/modules/displaytags/helpers/displaytags_event.php
@@ -0,0 +1,37 @@
+<?php defined("SYSPATH") or die("No direct script access.");
+/**
+ * Gallery - a web based photo album viewer and editor
+ * Copyright (C) 2000-2011 Bharat Mediratta
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+class displaytags_event_Core {
+  static function pre_deactivate($data) {
+    if ($data->module == "tag") {
+      $data->messages["warn"][] = t("The DisplayTags module requires the Tags module.");
+    }
+  }
+
+  static function module_change($changes) {
+    if (!module::is_active("tag") || in_array("tag", $changes->deactivate)) {
+      site_status::warning(
+        t("The DisplayTags module requires the Tags module.  <a href=\"%url\">Activate the Tags module now</a>",
+          array("url" => html::mark_clean(url::site("admin/modules")))),
+        "displaytags_needs_tag");
+    } else {
+      site_status::clear("displaytags_needs_tag");
+    }
+  }
+}
diff --git a/3.0/modules/displaytags/helpers/displaytags_installer.php b/3.0/modules/displaytags/helpers/displaytags_installer.php
new file mode 100644
index 00000000..808def8a
--- /dev/null
+++ b/3.0/modules/displaytags/helpers/displaytags_installer.php
@@ -0,0 +1,36 @@
+<?php defined("SYSPATH") or die("No direct script access.");
+/**
+ * Gallery - a web based photo album viewer and editor
+ * Copyright (C) 2000-2011 Bharat Mediratta
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+class displaytags_installer {
+  static function install() {
+    module::set_version("displaytags", 1);
+  }
+
+  static function deactivate() {
+    site_status::clear("displaytags_needs_tag");
+  }
+
+  static function can_activate() {
+    $messages = array();
+    if (!module::is_active("tag")) {
+      $messages["warn"][] = t("The DisplayTags module requires the Tags module.");
+    }
+    return $messages;
+  }
+}
diff --git a/3.1/modules/displaytags/helpers/displaytags_event.php b/3.1/modules/displaytags/helpers/displaytags_event.php
new file mode 100644
index 00000000..7b92685e
--- /dev/null
+++ b/3.1/modules/displaytags/helpers/displaytags_event.php
@@ -0,0 +1,37 @@
+<?php defined("SYSPATH") or die("No direct script access.");
+/**
+ * Gallery - a web based photo album viewer and editor
+ * Copyright (C) 2000-2011 Bharat Mediratta
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+class displaytags_event_Core {
+  static function pre_deactivate($data) {
+    if ($data->module == "tag") {
+      $data->messages["warn"][] = t("The DisplayTags module requires the Tags module.");
+    }
+  }
+
+  static function module_change($changes) {
+    if (!module::is_active("tag") || in_array("tag", $changes->deactivate)) {
+      site_status::warning(
+        t("The DisplayTags module requires the Tags module.  <a href=\"%url\">Activate the Tags module now</a>",
+          array("url" => html::mark_clean(url::site("admin/modules")))),
+        "displaytags_needs_tag");
+    } else {
+      site_status::clear("displaytags_needs_tag");
+    }
+  }
+}
diff --git a/3.1/modules/displaytags/helpers/displaytags_installer.php b/3.1/modules/displaytags/helpers/displaytags_installer.php
new file mode 100644
index 00000000..808def8a
--- /dev/null
+++ b/3.1/modules/displaytags/helpers/displaytags_installer.php
@@ -0,0 +1,36 @@
+<?php defined("SYSPATH") or die("No direct script access.");
+/**
+ * Gallery - a web based photo album viewer and editor
+ * Copyright (C) 2000-2011 Bharat Mediratta
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+class displaytags_installer {
+  static function install() {
+    module::set_version("displaytags", 1);
+  }
+
+  static function deactivate() {
+    site_status::clear("displaytags_needs_tag");
+  }
+
+  static function can_activate() {
+    $messages = array();
+    if (!module::is_active("tag")) {
+      $messages["warn"][] = t("The DisplayTags module requires the Tags module.");
+    }
+    return $messages;
+  }
+}