Compatibility Issue: JSException displayed when running applet using IE

Steps to reproduce:
1. Browse to http://www.popcap.com
2. Click "All Games"
3. Click on 'Candy Train'
4. Play Game
5. Refresh page (F5)
6. Open applet in new window (CTRL N)
7. Resize applet window
8. Close applet window
9. Check Java Console for errors

The following exception was displayed in console: netscape.javascript.JSException: Unknown Name.

No exception is displayed with MSVM. But exception is displayed with Sun JVM (1.5.0_09-b01, 1.5.0_08fcs and 1.5.0fcs). This indicates compatibility issue with IE.

There is another bug already filed for this exception: CR#6438185. However, the priority of that is "4-Low". I am filing this as "2-High" as this is important for update releases.