if (e.keyCode == 38) {
       //up
       drawsprite('b1');
       function moveu(bottom,timer){
            if(bottom == 2){
                drawsprite('b2');
            }
            if(bottom == 4){
                drawsprite('b1');
                clearTimeout(timer);
                return false;
            }
            bottom += 1;
            ctx.mytranslate(0, 4);
            var timer = setTimeout(function(){ moveu(bottom,timer) },50);
       }
       moveu(0);
       return false;
    }