Loading externals: button and dynamic field in diff movies w/ CSS

I am using mc and few scenes. I am trying to have a button in one mc load an external txt in another mc with the dynamic text field.

this is the script for the button classDescription in a MC called nav_menu

on (release) {
var style_sheet = new TextField.StyleSheet();
var css_url = “photo_style.css”;
style_sheet.load(css_url);
holder.styleSheet = style_sheet;
loadVariables(“classDesc.txt”, this);
}

I want it to load classDesc.txt into the dynamic text field (instance name is holder) in a MC called body_dynamic.

What is needed to get it to load the external when the button and the text field are in different movies?

little help… just need to know syntax and path