Sunshine photo cart photo upload size

Hello,

I am trying sunshine photo cart right now and it really looks good.
However I have a question regarding the photo sizes I am uploading.
I want to offer my clients downloads in full resolution so I have to upload the photos at their maximum size.
When I view a gallery in thumbnail view everything is fine but when I click a photo it seems to display the full size image and this takes a lot of time. This would be totally unusable for my clients because they would have to wait to long when switching from one photo to another.

Is there any possibility to display an image larger than the thumbnail but not the full size image?

Thanks for an info concerning this.

Best regards,

Markus Schlu?meier