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.

You can try this <%= f.select :button, [“1”, “2”,“3”] %>