Just for the inexperienced builder a crack of this nature is easier to fix if you know how....

What you will want to do is grab some Titebond glue and some adhesive tape (the blue stuff should work). Work the glue into the crack as well as you can then apply several long strips of of tape along the side edges of the guitar (roughly at 90degrees to the crack). Then stretch the tape one strand at a time and place the tape across the crack and along the length of the body ending at the opposite side of the guitar. Repeat the process with as many additional strands as necessary to 'pull the sides together' until the crack closes. Wipe up the excess glue and your guitar should look as good as new.