LoadMovieNum having trouble passing variables and Google won't help

[paphone]

I've read a couple of forum post slightly touching on this, but nothing really seems to help.
I have two movies. The first movie is a navigation bar populated with titles of photography.
When a button in clicked in the first movie it loads the second movie, a thumbnail image player.

The thumbnail player is just a standard dynamic image library that pulls it's info from an xml file.
What I would like to do is define a variable for each button in the first movie which would pass to the thumbnail movie and tell it which XML file to call

something like this:
Movie 1:
NAV  (var to send)
New York    (ny)
Memphis      (mem)

Movie 2:
the same movie but would call _______.xml depending on whichever button is clicked

Here is the code I have for the buttons in the 1st movie:

on(press){   
var display="memphis";
loadMovienum("player.swf",2,"POST");
}

I don't know if that right or where to go from there.

Thanks!

[Jorge Solis]

The loaded movie could look for some variable, let's see a _global variable to simplify:

on(press){   
_global.display="memphis.xml";
loadMovienum("player.swf",2,"POST");
}

In the loaded movie:

myXML.load(_global.display)

Jorge