[Javascript] Dynamic List Box Question

[M V]

Can anyone tell me the best way to do the following in

DHTML/JavaScript:

Generate an html page that has a listbox, and two
buttons 
marked 'Move up'and 'Move down'. When an item is
selected, and either 
button is pressed,reorder the list so that the
highlighted item moves 
one spot in the clicked direction.

Also, how complicated would this script be and does
anyone know if 
there are any freeware scripts available that would
perform this 
function.

Thanks!

Maria
 


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