+<!DOCTYPE html>
<html>
<head>
+ <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7; IE=EmulateIE9">
<title>zoom</title>
<!--[if IE]>
<script type="text/javascript" src="../excanvas.js"></script>
<br> <br>
<input type="button" value="Unzoom" onclick="unzoomGraph()">
<br> <br>
- <input type="button" value="pan frame 0" onclick="panEdgeFraction(0)">
+ <input type="button" value="pan frame null" onclick="panEdgeFraction(null)">
<input type="button" value="pan frame 0.1" onclick="panEdgeFraction(0.1)">
<input type="button" value="pan frame 0.5" onclick="panEdgeFraction(0.5)">
</p>