RunningJumper: I think you would find your squatting much more effective if you added weight to it and cut down the reps. Doing 100 bodyweight squats is probably a good cardio workout and may build some endurance strength but if you are looking to build muscle/strength/explosiveness (vertical jump) I really gotta recommend adding weights.
If you don't have much weight available, two bags filled with canned good in each hand will do. You may also want to consider lunges. Check them out on youtube.
Props for hitting the squats though. You have no idea how many people I know that just flat out don't workout their lower body at all. Squats are one of the single best motions you can do for your health.