function setTwoColumnsHeight(id_1, id_2) {
    height_1 = document.getElementById(id_1).offsetHeight;
    height_2 = document.getElementById(id_2).offsetHeight;

    if (height_1 > height_2 || height_1 == height_2) height_new = height_1;
    else if (height_2 > height_1) height_new = height_2;
    
    document.getElementById(id_1).style.height = height_new + 'px';
    document.getElementById(id_2).style.height = height_new + 'px';
}

function setColumnsHeight() {
    setTwoColumnsHeight("subLeft", "subRight");
    setTwoColumnsHeight("left", "right");
}