document.bind('keydown', function(e) {
    switch (e.which) {
    case 37:
        /* !moving left */
        // code
        break;
    case 39:
        /* !moving right */
        // code
        break;
    case 38:
        /* !moving up */
        // code
        break;
    case 40:
        /* !Baller is moving down */
        //code
    }
});