I'm curious; how did you do that widget on the SO FAQ page, where the question sidebar scrolls up with the page until it reaches the window top, then stays put while the rest of the page continues to scroll?
closed as off topic by Michael Petrotta, Mat, Manishearth, Matt, jadarnel27 Jul 3 '12 at 13:23
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This menu is warped with a div, starting with parameters
Now a script runs and when the top of this div is getting out of the screen this div get the style
You can call that floating menu, and I have found and use in the past relative to that style here : http://www.dynamicdrive.com/dynamicindex1/staticmenu.htm