This example uses the PTZoom extension to show partial panoramas in PTViewer. This method should be used with small fields of view.
Code:

<applet name="ptviewer" archive=ptviewer.jar  code=ptviewer.class width=320 height=200>
<param name=applet0  value="{code= ptzoom.class} 
                            {file=Insert.jpg}
                            {progress=true}
                            {fov=57}">
<param name=inits    value="ptviewer:startApplet(0)">
<param name=panmin   value=-28 >
<param name=panmax   value= 28 >
<param name=tiltmin  value=-18 >
<param name=tiltmax  value= 18 >