Dear Experts

While I was reading the story in the link blowe :

http://au.news.yahoo.com/latest/a/-/latest/9581699/toddler-badly-burnt-in-unit-fire /

I came across this quote
"Had it not been for their quick thinking, it would have been a different story,"
I feel there is a typo ,,,,missing "if clauses"

If someone shed any light on this I would be grateful ?

Regards
The 'if' clause has an alternative structure:

Had it not been for = If it had not been for.
Thanks for that.

Edit : I just realized that the question below is realted to my thread as well

http://www.EnglishForward.com/English/WouldHaveBeenOrHadItBeen/crmx/post.htm

"Had it been" means "If it was/were"