How to start a Youtube video from a precise time

You suppose that your video is the following:

http://www.youtube.com/watch?v=_bNmmqN1fzY

and you want show directly the minute 9 and 18 second.

Then you have to put the following code at end of the url:

#t=9m18s

http://www.youtube.com/watch?v=_bNmmqN1fzY#t=9m18s