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