Second list of items from selected item in first list

Hi all,
I have 2 dropdown lists in my jsp page. i am retrieving data from database for my first list box. the second list box data should be displayed when user select an item from the first list. the selected item from first list is necessary to get another list of items in second list. i dont want to use any buttons or submits. i want to redirect the data to the same page to get another list when user click one option from first list. Thanks in advance for any suggestion.

use ajax or store the data in javascript array

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http://www.vincentdeelen.com/images/otn/OTN_COLLECTION_REPORT_DA1.png
http://www.vincentdeelen.com/images/otn/OTN_COLLECTION_REPORT_DA2.png
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http://vincentdeelen.blogspot.com

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