Last Thursday when I surfing the net, I stumbled upon this website. I found it a very cool way to enlarging thumbnails without refreshing the whole page. So I try it and I like it very much, because it is very convenient, lightweight and cool! Im using a similar service which is Lightbox 2, and I prefer HighSlide JS method. Below is my testing with HighSlide JS. Click on the picture and try it!
Instruction: Click to enlarge, use left or right arrow key to change image. Esc to return.