function calcHeight()
{
  //find the height of the internal page
  var the_height=
    document.getElementById('zsgFrame').contentWindow.
      document.body.scrollHeight;

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

document.write('<IFRAME id="zsgFrame" src="widget/form.php" width="300px" scrolling="no" frameborder="0" height="400px" ></IFRAME>');