Could somebody please recommend to me the name of
a good book or website that would explain the basics
of what kosher is all about (e.g., the rules and
regulations), especially as they pertain to dairy.  I know
next to nothing about kosher, and would like to learn
how eating at kosher restaurants or seeking kosher
meals on airplanes, etc., might save me from the need
to examine ingredients all the time or the need to take
lots of Lactaid pills "just in case" when I go to
restaurants.

Thanks,

Dave