Image swap when clicked in product detail page?

[calico]

I would like to make my images swap when clicked in product detail page and not have it popup window like the site below:

http://www.leatherup.com/p/Biker-Sta...ng/131406.html

Is this possible? If so how would I go about achieving this? If someone could please help I would really appreciate it. Thanks

Here's a link to a product listing on my cart:

Here

I’m using zen cart 1.3.9

Mike