Jumping and sidescrollers

programming
1

Hey guys, I have been working on a sidescroller system and I have the left and right movements done, but I am at a loss as to how I can have him jump and have the gravity kick in. Here is the current code.

onClipEvent (load) {
    fallspeed = 8;
    platforms = 1;
    speed = 5;
    falldec = 1.95;
}
onClipEvent (enterFrame) {
    fallspeed += falldec;
    this._y += fallspeed;
    for (i=1; i<=platforms; i++) {
        ground = _root["g"+i];
        if (this.hitTest(ground)) {
            this._y -= fallspeed;
        }
    }
    if (Key.isDown(Key.SPACE) && jumping != true) {
        jumping = true;
    }
    if (jumping == true) {
    //What to put here?
    }
    
    if(Key.isDown(Key.LEFT)){
        this._x -= speed;
        this._xscale =-100;
        this.gotoAndStop("run");
        //_root._x += speed;
    }
    else if(Key.isDown(Key.RIGHT)){
        this._x += speed;
        this._xscale =100;
        this.gotoAndStop("run");
        //_root._x -= speed;
    }
    else{
        this.gotoAndStop("idle");
}
}

The comments about the Root x position are simply to move the stage later on, not sure about them currently though.
I can upload the Fla later If need be, any help is appreciated. Thanks guys :smiley: