function getById(name)
{
  if ( document.all ) return document.all[name];
  else if ( document.getElementById ) return document.getElementById(name);
  return null;
}

function heightToMultiple(name, multiple, padding)
{
  var obj = getById(name);
  var h = obj.offsetHeight;
  h += multiple - ((h - 1) % multiple) - 1 - padding;
  obj.style.height = h + 'px';
}