Try clicking and dragging the mouse left, right, up and down within the image to look around.
On the Mac: hold down the option key.
On the Mac: hold down the control key.
This site contains Panoramic Photos taken using Apple's "Quicktime VR" technology. The ability to view these images is not built in to most web browser, and typically requires the QTVR Plug-in extension. If you are seeing a "broken plugin" icon instead of an image, you will need to download and install the plug-in into the "Plug-ins" folder inside your web browser's folder. Currently, most browsers require you to quit and relaunch the program before they will recognize the new plug-in.
To get the latest version, try first going to Apple's QTVR web page. If that's busy, you can get a copy of the Mac version here. Note that after expansion, you will get two files: "Quicktime VR Plug-in" and "QuickTime VR Components." Both are required.