signed Java applications support?

[Hetz Ben Hamo]

Hi,

I'm trying the web-cd-write software on my serveer - it's an application that 
launches a java applet to let you upload files and burn them on your server's 
CD-RW...

URL: http://wwwhomes.uni-bielefeld.de/jhaeger/webCDwriter/

The problem: When launched from Konqueror, it loads an applet but it fails. 
With Mozilla it opens a windows and asks if I want to use this signed 
application...

Suggestions?

Thanks,
Hetz