Index: modules/system/system.js
===================================================================
RCS file: modules/system/system.js
diff -N modules/system/system.js
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ modules/system/system.js	11 Feb 2007 21:50:30 -0000
@@ -0,0 +1,24 @@
+/**
+ * Internal function to check using Ajax if clean URLs can be enabled on the
+ * settings page.
+ * 
+ * This function is not used to verify whether or not clean URLs
+ * are currently enabled.
+ */
+Drupal.cleanURLsSettingsCheck = function() {
+  var url = location.pathname +"admin/settings/clean-urls";
+  $("#clean-url .description span").html('<div id="testing">'+ Drupal.settings.cleanURL.testing +"</div>");
+  $("#clean-url p").hide();
+  $.ajax({url: location.protocol +"//"+ location.hostname + url, type: "GET", data: " ", complete: function(response) {
+  	$("#testing").toggle();
+    if (response.status == 200) {
+      // Check was successful.
+      $("#clean-url input.form-radio").attr("disabled", "");
+      $("#clean-url .description span").append('<div class="ok">'+ Drupal.settings.cleanURL.success +"</div>");
+    }
+    else {
+      // Check failed.
+      $("#clean-url .description span").append('<div class="warning">'+ Drupal.settings.cleanURL.failure +"</div>");
+    }
+  }});
+}
Index: modules/system/system.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.module,v
retrieving revision 1.448
diff -u -p -r1.448 system.module
--- modules/system/system.module	4 Feb 2007 21:20:50 -0000	1.448
+++ modules/system/system.module	11 Feb 2007 21:50:32 -0000
@@ -572,23 +572,34 @@ function system_site_information_setting
 }
 
 function system_clean_url_settings() {
-  // We check for clean URL support using an image on the client side.
   $form['clean_url'] = array(
     '#type' => 'radios',
     '#title' => t('Clean URLs'),
     '#default_value' => variable_get('clean_url', 0),
     '#options' => array(t('Disabled'), t('Enabled')),
-    '#description' => t('This option makes Drupal emit "clean" URLs (i.e. without <code>?q=</code> in the URL.)'),
+    '#description' => t('This option makes Drupal emit "clean" URLs (i.e. without <code>?q=</code> in the URL).'),
   );
 
   if (!variable_get('clean_url', 0)) {
     if (strpos(request_uri(), '?q=') !== FALSE) {
-      $form['clean_url']['#description'] .= t(' Before enabling clean URLs, you must perform a test to determine if your server is properly configured. If you are able to see this page again after clicking the "Run the clean URL test" link, the test has succeeded and the radio buttons above will be available. If instead you are directed to a "Page not found" error, you will need to change the configuration of your server. The <a href="@handbook">handbook page on Clean URLs</a> has additional troubleshooting information. !run-test', array('@handbook' => 'http://drupal.org/node/15365', '!run-test' => '<a href ="'. base_path() .'admin/settings/clean-urls">'. t('Run the clean URL test') .'</a>'));
+      drupal_add_js(array('cleanURL' => array('success' => t('Your server has been successfully tested to support this feature.'), 'failure' => t('Your system configuration does not currently support this feature. The <a href="http://drupal.org/node/15365">handbook page on Clean URLs</a> has additional troubleshooting information.'), 'testing' => t('Testing clean URLs...'))), 'setting');
+      drupal_add_js(drupal_get_path('module', 'system') .'/system.js', 'module');
+      drupal_add_js('
+// Global Killswitch
+if (Drupal.jsEnabled) {
+  $(document).ready(function() {
+    Drupal.cleanURLsSettingsCheck();
+  });
+}', 'inline');
+
+      $form['clean_url']['#description'] .= ' <span>'. t('Before enabling clean URLs, you must perform a test to determine if your server is properly configured. If you are able to see this page again after clicking the "Run the clean URL test" link, the test has succeeded and the radio buttons above will be available. If instead you are directed to a "Page not found" error, you will need to change the configuration of your server. The <a href="@handbook">handbook page on Clean URLs</a> has additional troubleshooting information.', array('@handbook' => 'http://drupal.org/node/15365')) .'</span>';
+
       $form['clean_url']['#disabled'] = TRUE;
+      $form['clean_url']['#prefix'] = '<div id="clean-url">';
+      $form['clean_url']['#suffix'] = '<p>'. t('<a href="@clean_url">Run the clean url test</a>.', array('@clean_url' => base_path() .'admin/settings/clean-urls')) .'</p></div>';
     }
     else {
-      $form['clean_url']['#description'] .= t(' You have successfully demonstrated that clean URLs work on your server. You may enable/disable them as you wish.');
-      $form['#collapsed'] = FALSE;
+      $form['clean_url']['#description'] .= ' '. t('Your server has been successfully tested to support this feature.');
     }
   }