HI! thanks so much for the response.

I did do as you said...

I defined

define('BUTTON_IMAGE_PRODUCT_FILTER', 'button_search.gif');

In both

/includes/languages/english/button_names.php

AND

includes/languages/english/extra_definitions/template29011/product_filter_defines.php
But my issue is that the template itself needs to call up this button and I dont know how to change the code.

Normally its some kind of php echo zen_image type of statement - any ideas how to rewrite that one line of code?