Try this link http://java.sun.com/security/signExample12/, or do a google search. The way we have done this is to create a jar file and sign the jar (DUKE certificate?!) also search for .java.policy file. Sorry, my knowledge on this is vague so I can't post examples here, I have been involved in a project where we had a signed applet, but I was on the coding side, not the setup stuff so I don't know the exact details. I just know we signed it to have it running in a JFrame from the browser but so that it look slike a normal window.
thank u ben. let the text be there. but how to change the background color of that bottomline text. also, since 'm using JOptionPane.showMessageDialog(), how'll i change the background color of it.