function fixBoxes()
{
  var boxes = {
    'welcome':  getNode('welcomeBox'),
    'catalog':  getNode('catalogBox'),
    'products': getNode('productsBox'),
    'news':     getNode('newsBox')
  }

  boxes['welcome'].style.height  = boxes['catalog'].style.height = (Math.max(boxes['welcome'].offsetHeight, boxes['catalog'].offsetHeight) - 10) + 'px';
  boxes['products'].style.height = boxes['news'].style.height = (Math.max(boxes['products'].offsetHeight, boxes['news'].offsetHeight) - 10) + 'px';
}

registerEvent(window, 'load', fixBoxes);