The logical flow of document: is header, nav, content, footer. Incidentally, if you don't use real text for your site name, search engines will never find you. Similarly, robots, language translators and screen readers can't read images. Instead of using images for your site name, consider using a custom web font from Typekit or Edge Web Fonts.
For a sticky footer.
footer {
position:fixed;
bottom:0;
left:0;
}
Nancy O.