Pre-loading normal sized images or a loading indicator when changing images

[M-Barari]

Hi, first of all thanks for the package.
and my problem: when changing images by selecting thumbs (or mouseOver) , if the internet connection speed is slow, nothing happens until the image is fully loaded , then the image changes. so it will be nice to load normal size images even when not selected (pre-load) or at least use a loader, like zoom panel.
I would be happy if you can help me.
thanks.