Animated dials question

Hi,

I need a tutorial on how to create an animated dial like the ones on this page;

http://urologists.net.au/dr-howard-lau-urologist-westmead-nsw

In the middle of the page there is a section where you 'Rate a doctor' for Staff, Punctual, Helpful, Knowledge.

I need a either a tutorial or I need to know what those dials are called so I can search G.

Many thanks for your help.