diff --git a/install.php b/install.php
index 5b4e3f8654f828569833224daf9dbd72ed5a891a..87ac52bc5da99950fded4ae18656c3a5bddb6462 100644
--- a/install.php
+++ b/install.php
@@ -728,13 +728,7 @@ function install_tasks($profile, $task) {
       // We add these strings as settings because JavaScript translation does not
       // work on install time.
       drupal_add_js(array('copyFieldValue' => array('edit-site-mail' => array('edit-account-mail'))), 'setting');
-      drupal_add_js('
-// Global Killswitch
-if (Drupal.jsEnabled) {
-  jQuery(document).ready(function() {
-    Drupal.cleanURLsInstallCheck();
-  });
-}', 'inline');
+      drupal_add_js('jQuery(function() { Drupal.cleanURLsInstallCheck(); });', 'inline');
       // Build menu to allow clean URL check.
       menu_rebuild();
 
diff --git a/misc/drupal.js b/misc/drupal.js
index 9e6d9c40614d84af6208756ebee49b6f47a65cfe..b0cf64ce179c969049c2f32c28b268448a03f7d0 100644
--- a/misc/drupal.js
+++ b/misc/drupal.js
@@ -15,11 +15,6 @@ if ($ === undefined) {
 
 (function($) {
 
-/**
- * Set the variable that indicates if JavaScript behaviors should be applied.
- */
-Drupal.jsEnabled = document.getElementsByTagName && document.createElement && document.createTextNode && document.documentElement && document.getElementById;
-
 /**
  * Attach all registered behaviors to a page element.
  *
@@ -317,17 +312,16 @@ Drupal.ahahError = function(xmlhttp, uri) {
   return message.replace(/\n/g, '<br />');
 };
 
-// Global Killswitch on the <html> element.
-if (Drupal.jsEnabled) {
-  // Global Killswitch on the <html> element.
-  $(document.documentElement).addClass('js');
-  // 'js enabled' cookie.
-  document.cookie = 'has_js=1; path=/';
-  // Attach all behaviors.
-  $(document).ready(function() {
-    Drupal.attachBehaviors(this, Drupal.settings);
-  });
-}
+// Class indicating that JS is enabled; used for styling purpose.
+$('html').addClass('js');
+
+// 'js enabled' cookie.
+document.cookie = 'has_js=1; path=/';
+
+// Attach all behaviors.
+$(function() {
+  Drupal.attachBehaviors(document, Drupal.settings);
+});
 
 /**
  * The default themes.