//resize iframe http://www.programmingtalk.com/showthread.php?t=25995
function calcHeight(myframe)
{
  //find the height of the internal page
  var the_height=
    document.getElementById(myframe).contentWindow.
      document.body.scrollHeight;

  //change the height of the iframe
  document.getElementById(myframe).height=
      the_height + 20;
}