Boxes And Arrows : The Design Behind the Design

So I am hoping someone can help me with this. A few days ago I came across a site (or at least I think I did) where there was a list of elements on a page that required scrolling. Now the scrollbar would appear only when my mouse was on the list. The moment my mouse rolled off, the scroll bars would disappear, making the page design more cohesive by not adding unnecessary scrollbars when not in use.
Can someone confirm if this behavior can be achieved in a non flash HTML (html5/javascript/jquery/etc.) type of environment?
I am trying to propose this model in a WF and want to make sure it can be done.

Thanks!
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