Try this:
<html>
    <body>
   <table border=0 >
   <tr>
   <td align="center">
            <APPLET name="cvcs" CODEBASE="http://192.168.0.xx/" CODE="xplug.class" WIDTH=640 HEIGHT=480>
                <param name="RemotePort" value=80>
                <param name="Timeout" value=5000>
                <param name="RotateAngle" value=0>
                <param name="PreviewFrameRate" value=2>
                <param name="DeviceSerialNo" value="yourserialno">
            </APPLET>
   </td>
   <td align="center">
            <APPLET name="cvcs" CODEBASE="http://192.168.0.xx/" CODE="xplug.class" WIDTH=640 HEIGHT=480>
                <param name="RemotePort" value=80>
                <param name="Timeout" value=5000>
                <param name="RotateAngle" value=0>
                <param name="PreviewFrameRate" value=2>
                <param name="DeviceSerialNo" value="yourserialno">
            </APPLET>
   </td>
   </tr>
   </table>
    </body>
</html>
with the DCS-920 itried this from my local network, filled in my local internal IP address and port # (the ones i manually put in to access when on the same network) as well as my serial number.
i was able to see the java logo loading real quick, but then no video ever displayed.
I tried in IE also, was prompted to allow blocked activex component, but after letting it through, just white html page.  
is there anything else that i need to include within the html?