How many diphthongs are there in English?

Answer 1

http://www.btinternet.com/~ted.power/esl0105.html

from http://www.google.com/search?q=english+diphthongs&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA