From the tutorial:
<APPLET CODE="Animator.class" WIDTH=460 HEIGHT=160>
<PARAM NAME="imageSource" VALUE="images/Beans">
<PARAM NAME="backgroundColor" VALUE="0xc0c0c0">
<PARAM NAME="endImage" VALUE=10>
<PARAM NAME="soundSource" VALUE="audio">
<PARAM NAME="soundtrack" VALUE="spacemusic.au">
<PARAM NAME="sounds"
VALUE="1.au|2.au|3.au|4.au|5.au|6.au|7.au|8au|9.au|0.au">
<PARAM NAME="pause" VALUE=200>
. . .
</APPLET>
You need to make the appliet size script variables and post them from your caller.