function prepareBalls(images){
            reader = new FileReader();

            for(var i = 0; i<images.length; i++){

                reader.onload = function(e){
                    var placeIsGood = false;
                    var image = document.createElement('img');

                    image.src = reader.result;

                    var startAngle = Math.floor(Math.random()*360) * Math.PI/180;

                    var speed = 1 + Math.floor(Math.random()*5);

                    var velX = Math.cos(startAngle) * speed;
                    var velY = Math.sin(startAngle) * speed;

                    while(!placeIsGood){
                        var r = 20;
                        var X = r + Math.floor(Math.random()*width) - r;
                        var Y = r + Math.floor(Math.random()*height) - r;

                        var ball = makeBall(X,Y,r,image,velX,velY);
                        if(canDrawHere(ball)){
                            placeIsGood = true;
                        }
                    }

                    balls.push(ball);
                };

                reader.readAsDataURL(images[i]);
            }

        }

        function canDrawHere(ball){
            var result = true;
            for(var i=0; i<balls.length; i++){
                if(detectCollision(ball, balls[i])){
                    result = false;
                }
            }
            return result;
        }

        function makeBall(x,y,r,data,Vx,Vy){
            var ball = {
            x:x,
            y:y,
            nextX:x,
            nextY:y,

            radius:r,
            img:data,
            mass: countVolume(r),

            Vx:Vx,
            Vy:Vy,

            draw:function(){
                var size = {width:40,height:40};

                var imgX = this.x - size.width/2;
                var imgY = this.y - size.height/2;

                context.save();
                context.beginPath();
                context.arc(this.x,this.y,this.radius,Math.PI*2,false);
                context.closePath();
                context.clip();

                context.drawImage(this.img, imgX, imgY, size.width, size.height);
                context.restore();

                context.beginPath();
                context.arc(this.x,this.y,this.radius,Math.PI*2,false);
                context.closePath();
                }
            };

            return ball;
        }