Viewing:
move your cursor over image
rotate camera: press and hold any [mouse button] and move
  wait few seconds if your mouse doesn't work immidiately
zoom out: [ctrl+mouse button]
zoom out: [ctrl]+[-]
zoom in: [shift+mouse button]
or: [ctrl]+[=]

Troubleshooting:
Question: I see only "install missing plugin" box.
Answer: download JRE (java runtime environment) from http://java.com/en/download/manual.jsp or follow your browser suggestions.