enlarge picture

Hi,

As a newbie i have a question ??

How can i make a picture bigger when i click on it. It would like, when i click on the map of Grand Canyon village that its zoom out a bit so you can have a better look. Like on this website Area Map – Grand Canyon South Rim (grandcanyoncvb.org)

Thanks

The page I need help with: [log in to see the link]