function setColumns() {
    var divs = new Array($('leftbar'), $('content'), $('rightbar'));
    var maxHeight = 0;
    for (var i=0; i<divs.length; i++) {
        if (divs[i].offsetHeight > maxHeight) maxHeight = divs[i].offsetHeight;
    }
    for (var i=0; i<divs.length; i++) {
        divs[i].style.height = maxHeight + 'px';
        if (divs[i].offsetHeight > maxHeight) {
            divs[i].style.height = (maxHeight - (divs[i].offsetHeight - maxHeight)) + 'px';
        }
    }
}