You should be looking at the pals/menupal.php file then. All the menus are contained in there.
However a word of caution on the work that might lie ahead. If you change the menupal.php and would like to add functionality similar to the "File Downloads" or "Recommend Us" i.e. click on the link and the page reloads with a different window on the middle/right section, then you will need to change the index.php file as well.
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