Index: system.js
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.js,v
retrieving revision 1.26
diff -u -r1.26 system.js
--- system.js	29 May 2009 19:51:43 -0000	1.26
+++ system.js	6 Jun 2009 13:19:17 -0000
@@ -128,4 +128,13 @@
   }
 };
 
+/**
+ * Disable the install buton when clicked
+ */
+Drupal.behaviors.disableButton = {
+	attach: function(context) {
+      $('#edit-save').click(function(){this.disabled = 'disabled'});
+  }
+} 
+
 })(jQuery);