Actonscript 2d scroller

onClipEvent(load){
	velx = 0
	vely = 0
	speed = 2
	fric = 1
	cap = 6
	gravi = 10
	jump = 40
}
onClipEvent(enterFrame){
	if(Key.isDown(65)){
		velx -= speed
	}
	if(Key.isDown(68)){
		velx += speed
	}
	if(Key.isDown(87)){
		if(hitTest(_root.plat)){
			if(vely == 0){
				vely -= jump
			}
		}
	}

	//y
	if(vely > 0){
		vely -= gravi
	}
	//if(vely < 0){
		//vely += gravi
	//}
	//x
	if(velx > 0){
		velx -= fric
	}
	if(velx < 0){
		velx += fric
	}

	//x cap
	if(velx > cap){
		velx = cap
	}
	if(velx < (0 - cap)){
		velx = (0 - cap)
	}

	//y cap
	//if(vely > cap){
		//vely = cap
	//}

	//if(vely < (0 - cap)){
		//vely = (0 - cap)
	//}

	//no drift
	if(velx < .1 && velx > 0){
		velx = 0
	}
	if(vely < .1 && vely > 0){
		vely = 0
	}

	//if(hitTest(

	//gravity
	if(!this.hitTest(_root.plat)){
		vely += gravi
	}

	trace(hitTest(_root.plat))

	this._y += vely
	this._x += velx


}