Ok. It s not a big problem i think. You need to verify that the jpct.jar file is correctly linked to your project. So you have to add its path to the CLASSPATH variable of your system (or directly in the command line when you launch your system, using the -classpath attribute).
There are other threads in the forum that are talking about the same problem. (just check it by making a research with the "classpath" keyword)
Another element that you have to put in the classpath is the lwjgl.jar file. You must also give an access to the lwjgl library.
When you want to add a jar file to an applet, you can do it this way
<APPLET CODE=a.class
ARCHIVE="abc.jar" // the url of the jar file to add
WIDTH=100
HEIGHT=100>
</APPLET>
Emmanuel