function CalcFrameHeight() 
// document.getElementById('content').Scrollheight = 0;
{
  document.getElementById('content').height = 0;
  var _height = document.getElementById('content').contentWindow.document.body.scrollHeight;
  document.getElementById('content').height = _height;
}


// <iframe ID="content" onload="CalcFrameHeight();" src="#content.php#" name="content" align="top" scrolling="no" width="570" frameborder="0"></iframe>