    <div id="div_g" style="width:600px; height:300px;"></div>


    <p><b>Zoom operations:</b></p>
    <p>
      <input type="button" value="Y (3,5)" onclick="zoomGraphY(3,5)">&nbsp;
      <input type="button" value="Y (0,4)" onclick="zoomGraphY(0,4)">&nbsp;
      <input type="button" value="Y (2,4)" onclick="zoomGraphY(2,4)">&nbsp;
      <input type="button" value="Y (0,2)" onclick="zoomGraphY(0,2)">&nbsp;
      <input type="button" value="Y (0,1)" onclick="zoomGraphY(0,1)">&nbsp;
      <br> <br>
      <in