Product slider, not moving between images properly

Hi there,

With a product with many photos, the image slider seems to not have the right width on each image transition as it does not move far enough. As you go through the photos you can see less and less of the next photo

Example here

http://deepweb.co.nz/petxcite/index.php/product/cat-costumes-wigs/

Looks like the 3dtransform is 10px less than the width of the image

Thanks in advance

Cheers

Steven