ball.prototype.draw = function() {
circle(this.x,this.y,3,true);
};

ball.prototype.move = function() {
+=this.xspeed;

this.y+=this.yspeed;
};


ball.prototype.checkcollison = function() {
if(this.x < 0|| this.x > 200) {
this.xspeed= -this.xspeed;
}
if(this.y < 0|| this.y > 200) {
this.yspeed= -this.yspeed;
}
};