function setH()
{
        var maxA = Math.max(document.getElementById('left').offsetHeight, document.getElementById('content').offsetHeight);
        var maxH = Math.max(document.getElementById('right').offsetHeight, maxA);

        document.getElementById('left').style.height=maxH+'px';
        document.getElementById('right').style.height=maxH+'px';
        document.getElementById('content').style.height=maxH+'px';
}