I have a problem with image gallery. It loads every picture before the true presentation begins. Is it because of too large image size (all of them are between 70-100 KB) or can I use certain functions to hide it from users ( the process of loading pictures) so they would only see once it begins. 

My site is under this link

http://www.pebedesign.pl/portfolio.html

Many thanks for help

Piotr