JDOSBOX, java script, appletts

Hello every one,...
I have been trying to figure out how to install a PC emulator on a website, Dose anyone know anything about this ?
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Con: The applets must be signed (can be self signed)
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APPLET CODE="jdos.gui.MainApplet" archive='jdosbox.jar' WIDTH=640 HEIGHT=400
param name="download1" value="http://jdosbox.sourceforge.net/doom.04.zip"
<param name="param1" value="imgmount e ~/.jdosbox/doom.04/doom.img -size 512,16,2,512"
<param name="param2" value="e:"
<param name="param3" value="doom"
<param name="param4" value="-conf ~/.jdosbox/doom.04/dosbox.conf"
/APPLET
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For example what do they mean about a signature,( signed, or unsigned ) How dose one sign it ?
This is what I have done so far, useing a differnt emulator,
http://creativeminds.webege.com/RETRO-04/retro-0.4/retroapplet.html
But the JDOSBOX one looks like it could be better, if I ever figure it out,...anyway if anyone here knows more about this stuff ,and is willing to help explain, please let me know... Thanks from Garry
http://creativeminds.webege.com/phpBB3/viewtopic.php?f=4&t=20