pop up list box

hi friends,

please visit this page and pout you mouse over any one of three hyperlinks
MSDN, Developer centers, Microsoft developer network

http://msdn.microsoft.com/en-us/aa570309.aspx

when you gonna do it, you would see a popup list box with slow animation just like if we are releasing a curtain down.

how can we do this ?

www.dynamicdrive.com has some menu's similar to that if I remember right

thanks a lot