Add js/icons/css for removing gadgets

Here's the patch I created a drupalcon. Everything should be working. Two questions:
First -- does anyone know what the right color for the messages should be according to the drupal.org styleguide?
Second -- The remove gadget behavior is degradeable but ugly meaning you can click on the link without javascript but it takes you to a blank page displaying on the message intended for the ajax function rather than returning you to your dashboard page with a message set. Can someone give me a pointer on how to check if js is disabled in my php function so the behavior is cleaner?