iframe1.html

<!DOCTYPE html>
<html>
<body>


Graph Type : <select onChange="changeSource(this.options[selectedIndex].value);">
 

   <option  value="mulineObj.html">Line</option>
  <option value=" muBarTest.html">Bar</option>
    <option  value="muPieTest.html" >Pie</option>
</select>


<iframe name="frPage2" src="mulineObj.html" width="1400" height="800" scrolling="no" frameborder="0">
<p>Your browser does not support iframes.</p>
</iframe>


</body>
</html>

<script>
function changeSource(newSource) {
parent.frPage2.document.location=newSource;
}
</script>