Изменение высоты iframe

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function ResizeIF()  
{  
  var ifh = window.parent.document.getElementById('frame').height;  
  var bh = document.body.scrollHeight;  
  var dh = document.documentElement.scrollHeight;  

  if (bh > 0 && dh > 0)  
  {  
    if(bh != ifh)  
    {  
      window.parent.document.getElementById('frame').height = bh;  
    }  
    else  
    {  
      window.parent.document.getElementById('frame').height = dh;  
    }  
  }  
}