function adjustLayout() {
  // Get natural heights
  var cHeight = xHeight("centercontent");
  var lHeight = xHeight("leftcontent");
 
  // Find the maximum height
  var maxHeight = Math.max(cHeight, lHeight) + 10;

  // Assign maximum height to all columns
  xHeight("center", maxHeight);
  xHeight("left", maxHeight);
}

window.onload = function() {
  xAddEventListener(window, "resize", adjustLayout, false);
  adjustLayout();
}