Here the myfile parameter is added. This is the name of the file containing your messages.
<applet code="jtmedium.class" width=440 height=310>
<param name = introloop value="sloop2.au">
<param name = mysonglist value= "dove.au sah.au frogs.au">
<param name = myfile value="withmess.txt">
<param name = myimagelist value="b03716.jpg diablo.jpg
b00205.jpg">
</applet>