How can I teach myself to whistle?

I have never been able to whistle, and several people have, through the years, tried to show me. However, I have never been able to do it. How can I teach myself?

Check out this site , Superdude:

http://www.learn2.com/08/0876/0876.asp

“Well that’s easy… You just put your lips together, and blow.” --sweethaaat!

sorry, couldn’t resist.