While we do not technically support putting images in the menu bar, you may be able to put small icons there through the use of CSS. The best place to find help for CSS questions of this nature is actually the CSS Customization Forum which can be found right here:
Please note one item however. I noticed that you have removed the WordPress.com footer from your site. This is a direct violation of our Terms of Service. If this is not undone immediately, your blog may be suspended.
You can read more about this any number of places, including right here: