var calc=1;
function calcHeight()
{
  if (calc!=1){return;}

  //find the height of the internal page
  var the_height=document.getElementById('FRAME1').contentWindow.document.body.scrollHeight + 100;

  if (the_height<400){the_height = 2000;}

  //change the height of the iframe
  document.getElementById('FRAME1').height=the_height;

}