<script type="text/javascript">  
  
var timeout;  
  
function clickAction() {  

                
    frameFitting();  
    var fr = document.getElementById('demo_frame').contentWindow.document.body.getElementsByTagName('a');

    for (var i=0; i<fr.length; i++) {  
        fr[i].onclick = function() {  
            clearInterval(timeout);  
            timeout = setInterval("frameFitting()",100);  
    
        }
    }
      
}  
  
function frameFitting() {
  
  
    document.getElementById('demo_frame').width = '560';  
    document.getElementById('demo_frame').height = document.getElementById('demo_frame').contentWindow.document.body.scrollHeight+50+'px';

    var h = document.getElementById('demo_frame').contentWindow.document.body.scrollHeight;
    
document.getElementById('demo_frame').height = h+'px';

}  
  
onload = clickAction;  
  
</script>  

<iframe src="text.html" id="demo_frame" align="center" scrolling="no" frameborder="0" marginheight="0" marginwidth="0"></iframe>