what is the code  that you using
whether any parameter exists in it or not
use command
<applet codebase = "d1.class">
</applet>
here d1.class is the class  name
or send me an example of the program.
Moreover, it seems your jdk path is not properly set as
you are using IDE.
if you can use simple jdk1.2.2 package.
it must run.