Glass and Mirrors - Broken window pane

My son broke a bedroom window pane this afternoon. I need someone to tell me how to fix this. It is a wooden window. HELP

I am assuming that it is an older double hung wooden sash. They can be fixed (right in place).......you have to go to the exterior side of the window...take a jack knife and dig out all of the old putty (that holds in the glass). They did have a putty softening tool (back years ago, when wood sash were more prevalent) I don't know if there are any that are still around, or not. While removing the putty, you will probably encounter some triangle shaped pieces of metal These are glaziers points. Save them if you can, although they should still be for sale at a local hardware store. Remove the broken pieces of glass, making sure all old putty and points are scraped away, cleanly back to the bare wood. I always liked to brush some raw linseed oil on the bare wood, and let it soak in. This will keep the new putty from drying out, when you install the new glass. Have the hardware store cut the glass to size that you need. Double strength glass usually is best for wooden sash. Lay a bed of new fresh putty (glazing compound) in the bottom edge.......on all four sides of the wooden sash. Carefull lay the cut glass into place, and gently press down squeezing out any excess putty. Carefully put the glaziers points back in around the sash.....two on each wood portion of the sash is best. Then finish it off with a new layer of putty around the glass. It is a little tricky at first, but you will get the hang of it. Do not attemp to paint the putty until it has set for a few days.