How do you footnote a website?

The website I want to cite is www.zebraair.com/id1.html





I want to cite the cost part where it says ';$795 per hour weekdays';





The author is unknown. How do you footnote a website?
Check out the link below. It depends on the format in which you are required to write.











http://owl.english.purdue.edu/owl/resour鈥?/a>