I inserted email@example.com lightbox code, everything works but I cant get the thumbnails on the product page to display.
Any help would be appreciated.
You need to make sure that the File System Path under > admin/settings/file-system reflects that you have here
<img src="<?=base_path()?>files/imagecache/product/<?=$imagePath?>" alt="<?=$title?>" title="<?=$title?>" class="imagecache imagecache-product">
<?php } ?>
I think in D6 the default is sites/default/file/etc... and not system/files/etc...
This was my problem with not being able to see the images on the product page. Once I changed the File System Path and re uploaded the images it all worked fine.