function fixheight() {
 var maxH = 0;
 var ids = ["content","sidebar"];
 // find the highest column
 for (var i=0;i<ids.length;i++) {
  var d = document.getElementById(ids[i]);
  if (d.offsetHeight > maxH) maxH = d.offsetHeight;
 }
 // set them all to be that height
 for (var i=0;i<ids.length;i++) {
  var d=document.getElementById(ids[i]);
  d.style.height = maxH+"px";
 }
}