function calcHeight()
{
  var the_height = 0;

  //find the height of the internal page
  the_height=
    document.getElementById('main').contentWindow.
      document.body.scrollHeight;

  //always keep at least height of 611 to maintain total site height of 735
  if(the_height < 611){
	the_height = 611;
  }

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