Fix single hung window glass that is cracked
I see in the bottom picture, the bottom is a tilt in sash, easy to remove. The top sash CAN be made a tilt in, it is missing the ballasts that keep it from dropping. It is now held in place by a metal or plastic clip that holds it in place. Find these, remove them and the sash will drop, and therefore, able to be removed. I see a screw visible near the tilt latch that may be one of the few to remove in order to drop the upper sash. Then again, that one may do nothing, I would expect to find the screws to lower the sash, under the upper sash, hidden by the lower sash. Remove the lower sash first the rest should go from there. 

Most tilt in windows work the same, raise it a little, pull the clips in toward the center, lower the top so the plane of the window is perpendicular to it normal position, and lift one edge up, either the left or right, does not matter.

The rest is the same as the other answer, it will cost a little more maybe since you have the bars between the glass, then again....