How to add the skin for applet application.

How to add the skin for applet application. There is a lot of way we can add the skin for applet application. The one way is that the SyntheticaAddons. Its available in exe file application.Need to install this application and apply the skin just copy and paste the jar. here is the link given to go to synthetica tool http://www.jyloo.com/syntheticaaddons/