It was a necessary requirement when we have to choose multiple selects, and we have to select multiple items from it.Soo, here is the code for simply doing it.Move Items From one Select Box to Another using JQuery is very simple.Just do it within two functions.
Also, you can test the demo and download the code from this page itself.
You can find the demo here
Also, You can download the zip file from here
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For using Jquery, we need the JQuery library jquery-1.4.2.min.js atleast.