Layer/OCG Visibility based on Combo Box Selection

Hello,
I'm VERY new to javascript, so please bear with me.  I have a combo box with multiple selections.  For some selections, I would like a separate OCG layer to appear, and with other selections that same layer to disappear.
For example:
ComboBox1: A, B, C
Layer 1 default: hidden
A - toggle layer 1: hidden
B - toggle layer 2: hidden
C - toggle layer 3: visible
I have seen the javascripting involved turning layers on/off with buttons, but I'm having some difficultly with the combo box. 
Thanks!
Mike

The code would be much the same as with buttons. Use the Validate event of the combo box to get the selected value (event.value) and show/hide the appropriate OCGs. If the combo box items have export values, you'd use the Keystroke event so you can get the export value of the selected item via the event.changeEx property: http://livedocs.adobe.com/acrobat_sdk/9.1/Acrobat9_1_HTMLHelp/JS_API_AcroJS.88.607.html

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