The purpose of AirSapper is to sabotage the Katyusha missiles while in the air so they won't reach Israel. The controls are simple - the left&right arrows are used to run around, the up arrow is used to jump, the down arrow is used to jump down from missiles(you need to hold it for a short while), and the space bar is used to sabotage the missiles. You need to hold the space bar until the missile starts to explode.
There are also enemies in the game, in the form of cannons(please accept my apology for classifying those things as cannons), and bonuses inside boxes. You need to open a box in order to get the bonus inside - and you do it in the same way you sabotage a missile.
Here is the link to download the game - http://www.geocities.com/someddyelse/AirSapper30.7.zip. you can activate the game from either the jar file or the batch file. This game needs java version 1.4 or higher in order to run.
Hope you have fun playing it!