This line checks to see if the user’s browser will understand the image object, which means that it has the ability to manipulate images via JavaScript (which is what we’re trying to accomplish).

Lots of high-res images can really spruce up a Web site. But they can also slow it down-- images are files, files use bandwidth, and bandwidth is directly related to wait times. It's time you get ...

This is where the image objects stored for later on learn about the actual physical files they’re associated with. In each case, set the src (read: “source”) property of the image object to ...