How to set values to varaible without complete refresh of page

hi,
I am very very new to apex development. I want to understand how I can achieve following in Apex form,
I have a LOV (p2_dept) in form with some values. Depending on the value selected on lov, another control (textbox p3_dept_loc) should be made visible.
I am using apex 4.1.1.00.23
Please help.

Use Dynamic Action.
based on the changes in LOV field (I am assuming thats a Select List), you will be able to set visible any other item or region.
Following links should help.
http://st-curriculum.oracle.com/obe/db/apex/r40/apexdynactions/apexdynactions_ll.htm

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http://img237.imageshack.us/img237/5758/screenshot012di2.jpg
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Please see screenshot=http://krisjones.freewebspace.com/apex.JPG
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How to set values to varaible without complete refresh of page

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