Sagging shed door

[Lee Daniels <DANIELS@alchem.chem.tamu.edu>]

I have a small (10' x 12') shed on which the door is sagging so that I have 
to lift it slightly to get it to close.  What's the best way to shore up 
my door?  The hinges are the long "barn-door" type.  

I've posted pictures of the door and a hinge at:
    http://acs.tamu.edu/~lmd1191/shed.html

Thanks! - Lee

   Lee M. Daniels         Laboratory for Molecular Structure and Bonding
   daniels@tamu.edu                                 Texas A&M University
   http://acs.tamu.edu/~lmd1191