html - 2 button's open in same iframe with JavaScript -


i want 2 button's open in same iframe. when button 1 active need button 2 empty frame , load link in there. possible? code (so far):

<body>  <input type="button" id="knopsql1" type="submit" value="1e klasse"></input>  <script>  document.getelementbyid('knopsql1').onclick = function() { var iframe = frames[0] || document.createelement('iframe');  iframe.src='http://www.example.com/sql.php'; document.body.appendchild(iframe); };  </script>  <input type="button" id="knopsql2" type="submit" value="2e klasse"></input>  <script>  document.getelementbyid('knopsql2').onclick = function() { var iframe = document.createelement('iframe');  iframe.src='http://www.example.com/sql2.php'; document.body.appendchild(iframe); };  </script> </body>


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