<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>
<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>