CSS Navigation Drops only in Google Chrome. Rails Tutorial Feedback

I am going through the awesome Rails Tutorial http://railstutorial.org/chapters/filling-in-the-layout#sec:custom_css I've run into an issue with the Navigation dropping down into the body of t开发者_如何学运维he page, but this only happens in Chrome (I'm on Linux, Ubuntu 10.10 if that matters). Here is a screenshot and a URL to show you actually what the navigation looks like before and after as I really can't explain it as well as I'd like. If I refresh a couple of times in Chrome it drops down the page like the "after" image I uploaded.

Here is a URL to the web page so you can recreate it: http://afternoon-wind-61.heroku.com/pages/home

Try it in Chrome, Firefox and IE as well.

Any insight in why this is happening would be appreciated.

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Adding

<%= javascript_include_tag :defaults %> 

in /app/views/layouts/application.html.erb solved this issue for me.