Problem running applet with Internet Explorer (Microsoft VM)

I am writing an applet using JDK 1.5, and the applet works fine with Netscape, and Internet Explorer with the Sun Java plugin. However, I need to make the applet work using Microosoft VM. The error I get is:

Error loading class: JCalendar

java.lang.NoClassDefFoundError

java.lang.ClassNotFoundException: JCalendar

at com/ms/vm/loader/URLClassLoader.loadClass

at com/ms/vm/loader/URLClassLoader.loadClass

at com/ms/applet/AppletPanel.securedClassLoad

at com/ms/applet/AppletPanel.processSentEvent

at com/ms/applet/AppletPanel.processSentEvent

at com/ms/applet/AppletPanel.run

at java/lang/Thread.run

Any ideas?

[689 byte] By [mm0000a] at [2007-10-2 15:14:05]