Navigating through nested arrays using XML [Flash 8 AS]

Hi,

I am trying to load in an XML file with nodes several levels deep, run through them and create an array that holds all the data which I can then access at will, using buttons to go forward and backward through each sub node (slide).

I have attached my working files and would very much appreciate some advice. I know I am not using the arrays correctly, and it is annoying me because I know this is sooo easy, but I am pretty stumped!!

Many thanks in advance.