"Skip to content" link changes visual focus, but not input focus

The problem is that when someone clicks a skip link, the viewport is scrolled to the #content, but pressing tab will bring focus to the site's main navigation. The expected behavior would be to select the first link in the #content, not the site's main navigation. Of course this is the browser's default behavior, and not really a _s bug, but it is an opportunity to make _s-based themes more accessible to users that navigate solely through keyboard input.

I learned about this issue via [an article written by Nicholas C. Zakas.](http://www.nczonline.net/blog/2013/01/15/fixing-skip-to-content-links/) He suggests setting focus to the #content using JavaScript. I've adapted his example to use jQuery and to better conform to [WordPress coding standards.](http://codex.wordpress.org/WordPress_Coding_Standards)