Pop up large images

I have all my thumb nails loaded.Pics look good on products page.
I did a batch file and made another set of images and named them (example) "picture_LRG.jpg"
The problem is when I click on larger image I get the same size image as on the products page.It does not go bigger.
I added the _LRG files to images,DVD and Larger folders and still nothing.

Can anyone help

Thank you

GRH

have you read the tutorial about large and medium size images and image preparation discusses this matter as well?

Maybe provide a link to your site to see if other problems can be spotted.

OK
Everything else is fine
I just cannot get the large image to load when I click on the enlarge image button

http://jwmdistributing.ca/ZenCart

Can someone pls have a look and any info would be helpful
Thank you