[Rails] dropdowns buttons in ruby

I am folowing this tutorial http://ruby.railstutorial.org and I want to make dropdowns buttons with several suboptions.

The code on this cite http://twitter.github.com/bootstrap/javascript.html#dropdowns helps me alot, but the button ist unclicable, I cannot by clicking on this button open my 3 suboptions. Should I add somewhere a javascript? If yes, where should I add it?

Thank you in advanced.

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