if (document.images) {
                          air = new Image();
                        air.src = '/img/fon_top4.jpg';
                        air_roll = new Image();
                        air_roll.src = '/img/anim1.gif';

}

function roll( letter, state ) {
if (!document.images) return;
document.images[letter].src = eval(letter + state + '.src');
}