Moving a movieclip with inertia

I have created movie clips which move by the press of a button but I am looking to master my control of moving it a bit more.
Attached is a fla that demonstrates what I do to move a movieclip.
At the following link the same thing is created but it does a wind up before moving… how could I modify my scripting to best suit this?

http://www.joshtodd.com/indexFlash.php

thanks
Andrew

oh and there is a delay before the clip moves… how can I emulate that?