The applet cann't be loaded and throw exception for 32 cases on 5u26b901

Bug description:The applet cann't be loaded and throw exception.
Testsuite name: applet
JDK/JRE tested: 5.0u26-rev-DISA_PIT¿5u26b901¿
32bit(jre-1_5_0_26-ea-bin-b901-windows-i586-03_sep_2010.exe)
OS/architecture: winvista-business-sp2-i586-ie8
Reproducible: Always
Reproducible on machine:
[If sometimes] Also reproducible on machine:
Is it a platform specific regression: N [If yes] Is it a new platform support:
N [If yes] Regression relative to OS version:
Is it a Regression :N
[If yes] Regression introduced in release/build:
Test result on FCS:
Test run log location:

#Steps to reproduce:
(1)Test case: set1u-1 Puzzle of the Day http://www.jigzone.com
(2)Browse to given URL.Click "Puzzle-of-the-day" under "Daily entertainment" section.

#Actual behavior:
After clicking the "Puzzle-of-the-day" button,the applet cann't be loaded and throw exception.

#Exceptions:
load: class jz.class not found.
java.lang.ClassNotFoundException: jz.class
         at sun.applet.AppletClassLoader.findClass(Unknown Source)
         at java.lang.ClassLoader.loadClass(Unknown Source)
         at sun.applet.AppletClassLoader.loadClass(Unknown Source)
         at java.lang.ClassLoader.loadClass(Unknown Source)
         at sun.applet.AppletClassLoader.loadCode(Unknown Source)
         at sun.applet.AppletPanel.createApplet(Unknown Source)
         at sun.plugin.AppletViewer.createApplet(Unknown Source)
         at sun.applet.AppletPanel.runLoader(Unknown Source)
         at sun.applet.AppletPanel.run(Unknown Source)
         at java.lang.Thread.run(Unknown Source)
basic: Exception: java.lang.ClassNotFoundException: jz.class


#Note:
(1)The following cases have the same issue.
set1u-1,set1u-2,set1u-3,set1u-4,set1u-7,set1u-9,set1u-15,set1u-14,set1u-16,set1u-17,set1u-21,set1u-23,set1u-29,set1u-33,set1u-35,set1u-40,set1u-43,set1u-44,set1u-47,set1u-49,set1u-52,set1u-53,set1u-54,set1u-56,set1u-58,set1u-60,set1u-61,set1u-62,set1u-67,set1u-68,set1u-71,set1u-73
(2)The case: set1u-14 failed on all verification platform.
(3)The case: set1u-68 passed on same configuration/6u10 b33 but failed on other verification platform,because the version of java is lower.

#validation:
1.same configuration/6u10 b33: Pass
2.same configuration/1.5.0 fcs ( b64 ): Pass
3.same configuration/5u22 b03 SE ( latest live 5uX from java.sun.com): Pass
4.same configuration/1.5.0_26 b03 j4b: Pass
5.same JDK ( test target ), same OS, FF 3.5.10: Pass