Java 7 Update 51 z 14.01.2014 blocked all applets, which are not signed by certificate authority. But it costs money, therefore my applets are an will never be signed by certificate authority. To run this applet, you have to add this web as trusted pages.
You can do it in Java Control Panel.
ls -l /etc/alternatives/java might help.)
Security tab and
Edit Site List....
Add, writte in http://www.sallyx.org/ and
click on the button