Help Scotty, for a little Kirupa gallery update

hi,

i just finish this great tutorial :
http://www.kirupa.com/developer/mx2004/xml_flash_photogallery.htm

it works perfectly… but i try to add a new feature to it :

adding a simple list to choose differents “theme”…
“theme” are a new XML entry.
each “theme” have a specifique list of pictures with comments ( like the original tutorial )

how do this ?