Attribute image replaces main product image on selecting attribute - support thread?

Hi :bigups:!
I found this quite nice contribution called :
Attribute image replaces main product image on selecting attribute
found at :
http://www.zen-cart.com/index.php?ma...roducts_id=994
and integrate in one of my zen carts - now i was wandering if this still would work if i install image handler². Image handler is needed to create small thumbnails, right? The normal behaviour of my zen cart is, that the thumbnails are just css-resized big images which is quit bad for loading times - maybe image handler is not needed and i' m just missing something to have "real" thumbnail images...
Any hints, help, experiences are very welcome - i didn`t find a support threat maybe we can use this thread as one...

Cheers