function expand(cel, delay_f) {
    ft = setTimeout(function() {
        cel.style.width = parseInt(cel.style.width) + 2 + 'px';
    }, delay_f);
}

function pack(cel, delay_f) {
    ft = setTimeout(function() {
        cel.style.width = parseInt(cel.style.width) - 2 + 'px';
    }, delay_f);
}