Firefox ClassNotFoundException (works in IE6)

Hi all,
I've recently rebuilt a java application with about ten classes in the default package - rather than buried in a package three layers down.
Now, instead of running in IE6 and Firefox as it did before, it only works in IE.
Anyone got any ideas?
This is how I'm invoking the applet:
<applet id="Mapplet" name="Mapplet" width="100%" height="100%"
codebase=""
code="nav/wdd/avlmap/AVLMapClient.class"
archive="http://navbox/mapserver/AVLMapClient.jar"
mayscript="mayscript" alt=""
>
Your browser is unable to load this applet - please contact tech support.
</applet>
Trying to run this under Firefox I get:
Java Plug-in 1.5.0_07
Using JRE version 1.5.0_07 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\SB
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
p: reload proxy configuration
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
basic: Stopping applet ...
basic: Removed progress listener: sun.plugin.util.GrayBoxPainter@1006d75
basic: Finding information ...
basic: Releasing classloader: sun.plugin.ClassLoaderInfo@17a29a1, refcount=0
basic: Caching classloader: sun.plugin.ClassLoaderInfo@17a29a1
basic: Current classloader cache size: 2
basic: Done ...
basic: Joining applet thread ...
basic: Destroying applet ...
basic: Disposing applet ...
basic: Quiting applet ...
basic: Joined applet thread ...
basic: Unregistered modality listener
basic: Registered modality listener
basic: Referencing classloader: sun.plugin.ClassLoaderInfo@1a626f, refcount=1
basic: Added progress listener: sun.plugin.util.GrayBoxPainter@16fa474
basic: Loading applet ...
basic: Initializing applet ...
basic: Starting applet ...
network: Connecting http://navbox/AVLMapClient.class with proxy=HTTP @ /101.113.129.51:8080
network: Connecting http://navbox/AVLMapClient.class with proxy=HTTP @ /101.113.129.51:8080
load: class AVLMapClient not found.
java.lang.ClassNotFoundException: AVLMapClient
     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)
Caused by: java.io.IOException: open HTTP connection failed.
     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 10 more
basic: Exception: java.lang.ClassNotFoundException: AVLMapClient
Under IE I get:
Java Plug-in 1.5.0_07
Using JRE version 1.5.0_07 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\SB
basic: Cache is enabled
basic: Location: C:\Documents and Settings\SB\Application Data\Sun\Java\Deployment\cache\javapi\v1.0
basic: Maximum size: unlimited
basic: Compression level: 0
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
p: reload proxy configuration
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
basic: Registered modality listener
liveconnect: Invoking JS method: document
liveconnect: Invoking JS method: URL
basic: Referencing classloader: sun.plugin.ClassLoaderInfo@6e3d60, refcount=1
basic: Added progress listener: sun.plugin.util.GrayBoxPainter@50d89c
basic: Loading applet ...
basic: Initializing applet ...
basic: Starting applet ...
network: Connecting http://navbox/mapserver/AVLMapClient.jar with proxy=HTTP @ /101.113.129.51
basic: Loading http://navbox/mapserver/AVLMapClient.jar from cache
basic: No certificate info, this is unsigned JAR file.
liveconnect: Invoking method: public void AVLMapClient.Repaint()
liveconnect: Invoking method: public void AVLMapClient.Repaint()
liveconnect: Invoking method: public void AVLMapClient.Repaint()

Note: applet tag at start of message above is old one for when I had the three-layers-deep package. Now code attribute is:
code="AVLMapClient.class"
not:
code="nav/wdd/avlmap/AVLMapClient.class"

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