> This tool is great,but I had some problems mirroring sites 
> that contained applets,during offline browsing only a gray 
> screen appeared in the place of the application.

Yes, I get that too -- mostly on "roll-over" type java applets.  If you open
the java applet in something like Notepad you can try to find related
filenames that the applet needs to operate.  I actually have a file called
"fphoverx.class" that I copy into the mirrored website and sometimes that
fixes the problem.  You could try to find that file on the Net.