Run Software update. If nothing comes up, then uninstall LW and go to the site and redld it. If it doesn't work, try the beta version.
If it still won't work, try uninstalling Java, then redlding and installing it (Java, not LW) again.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-