mironb on "Image preloader from zpGallerific on image page"

Hi
I would like to have java script "image preloading" effect and "fading in" effect on image page. This effect looks beautyfull when I enable option "Use Galleriffic script" in my zpArdoise theme but I want to have it only on image page. I don't like layout of galleriffic.
Any idea where I have to look in image.php and what to add in code ? Please give me something for start.