"About your application’s environment" not collapses

I'm new to Ruby and Rails too. I've installed Rails 3.0.9 and all seems
to be working fine. I've created a new app and started the server. The
page "Welcome aboard" shows fine. When clicked the link "About your
application’s environment", a box expands with the app environment info.
But, when clicked this link again, this box don't collapses. I think
that this is an error. My expected result is that this box collapses
after a second click.

I don't see any errors in the rails log folder neither the javascript
console.

The same result occurs with Rails 3.0.7. With Rails 2.3.7, the box
collapses fine.

More environment's info: Linux Gentoo & Ruby 1.9.2p180.

I cannot figure out how to debug this little problem (I'm not even sure
if my expectation is correct).

Please, I need some hints about this situation. Tell me if you need more
info.

Thanks for read this.
José María Michia

I'm new to Ruby and Rails too. I've installed Rails 3.0.9 and all seems
to be working fine. I've created a new app and started the server. The
page "Welcome aboard" shows fine. When clicked the link "About your
application’s environment", a box expands with the app environment info.
But, when clicked this link again, this box don't collapses. I think
that this is an error. My expected result is that this box collapses
after a second click.

It doesn't look like the html on that page is trying to do that - it
just updates the content of that box when the link is clicked

Fred