Visad Applet

I will be glad if some one can help me with a problem at hand now concerning
how to display my application in  a browser.Infact i HTMLConverter
installed,Java3D 1.2.1 also installed, but i get some errors like
NoclassDeffounderror,Visad/DisplayImpl;
i have no clue how to correct this.

appreciate any help.

thanks


Isaac.