Jquery: Load Data On A Combo Box Depending On Another

I have two combo boxes. Let's say the first one had values A, B, C And when I select A the second one should show me options 1, 2, and 3 If I select B, then the second one should h

Solution 1:

http://www.ajaxray.com/blog/2007/11/08/jquery-controlled-dependent-or-cascading-select-list-2/