[hardwired]

Code:

Error reading JTF file: shapes1.JTF
http://www.allaboutstuff.com/kids_games/shapes1.JTF
Error reading JTF file: Towers.JTF
http://www.allaboutstuff.com/kids_games/Towers.JTF
Error reading JTF file: abcgetem.JTF
http://www.allaboutstuff.com/kids_games/abcgetem.JTF

I'm unable to find your file "abcgetem.JTF"

Code:

  <applet code="Jamba/player/JambaPlayer.class" width="540" height="350">
  <param name="fps" value="15">
  <param name="filename" value="abcgetem.JTF">

Are they still there?
Is there any way to determine what it is that the newer versions of java do not like
Probably. Access to a source (.java) file and its corresponding data (filename) file would help, eg, JambaPlayer.java and abcgetem.JTF (in plain text).