Changing Main Nav Elements, Template Monster Template

I recently purchased a ZenCart Template Monster Template, this is my first time using ZenCart. I've been successful so far transitioning the template to my new look but am having trouble editing the main, global navigation items.

The layout can be seen here: http://nattiebleu.com/index.php?main_page=index

The navigation is just below the header and is what I am trying to edit, can anyone point me in the right direction as to which file to change these images with?

I've tinkered with tpl_header.php but have not been able to get the images to change out.

Thanks in advance.
Malan D.

Unfortunately, most of the TM templates, while attractive, are written outside of the default conventions used by Zen Cart, And as there are many authors for these , each handles it in their own way. So it is difficult to know or advise where they have placed this and how to alter it.

Your best option is to contact them about this