If ther's nothing but an "x" in the large window on the right (and
not an applet like this here), you must download and install
Java (-> free download).
(Here you don't see the working applet, just a picture of it!)
This Biorhythm-Program needs «Java» to run. «Java» is a very common computer-language in the internet. Many applications do run with «Java». Usually «Java» is included in the browser-packages, but since Microsoft's Windows-Version «XP», Explorer doesn't include «Java» anymore (Microsoft and Sun-Microsystems had some disagreements....). In this case you must download and install «Java» yourself, it's easy! With java installed on your computer you will be able to enjoy many other website-java-applications too!
First you have to download «Java» (follow the instructions for your Operating System) and then install «Java» on your computer (open the java-installation-program and follow the instructions).