function adjustGraphSize(a, b) {
    var diff = a.offsetHeight - b.offsetHeight;
    if (diff > 0) {
        with (b.style) {
            marginTop = diff + 'px';
        }
    } else if (diff < 0) {
        with (a.style) {
            marginTop = -diff + 'px';
        }
    }
}