XML Drop Down Menu + Adding Next/Prev Function

I am trying to create Next / Previous buttons to use in conjunction with the XML Drop Down Menu seen here: http://www.kirupa.com/developer/actionscript/xml_dropdown_menu.htm

Basically, I would like create buttons which would navigate the content back and forth once the user has made a selection within the drop down menu – so that they can navigate the xml content without having to go back to the drop down menu each time.

I’ve been trying to integrate a function similar to the next/prev found in this xml gallery: http://www.kirupa.com/developer/mx2004/xml_flash_photogallery.htm to work with the drop down.

I presume the function needs to call nextSibling or Child or something, but I have tried a few things to no avail.

Does anyone know how to make this work?