Depending on the nature of the break, it may just need glueing, or it may need extra reinforcement.
If it's a minor break, you can do it yourself. You can't push glue into a crack though. Remove all the hardware. Make sure your wife is nowhere near. Then use her vacuum cleaner hose to suck good quality wood glue (such as Resin W) through the crack - if necessary, slightly open the crack with a thin blade, to help. Then when the area is fully covered, clean off excess glue and clamp the repair for 24 hours.
Howard
January 2009
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix guitars.