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ASP.Net/C# Listbox Question - No postback

Hello all.  I have a kind of tough question.  Right now I have two listboxes.  The first multi select listbox the user can multi select items and then there is a filter button at the bottom of that first listbox.  Once the user hits that filter I filter a second listbox beside it called on the load function.  The 2nd listbox on the initial page load, loads all the values.  I want to change this to get rid of the first listbox filter button and everytime they multi select an item I want to filter the 2nd listbox without having to postback each time.  Any ideas how to handle this the easiest way say on the client with JS maybe or something, XML etc.  Thanks all
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sbornstein2
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sbornstein2
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