+3  A: 

It is a custom element ( maybe a div ) that acts like a scroll bar.

You can find a number of implementation using jQuery

jScrollPane

rahul  2009-10-07 06:48:58
+1  A: 

Here http://jebaird.com/blog/shortscroll-jquery-ui-google-wave-style-scroll-bar, it is similar but has not all Google Wave functionality.

Binyamin  2010-10-11 14:20:29

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