You can basically forget it. There are javascripts available at
javascript.internet.com and
www.dynamicdrive.com that will prevent
right-clicking, but that doesn't mean anything. Anyone who wants your
content can get it because the browser will cache the page into the file
system and all they have to do is find it. You can attempt to prevent them
from right-clicking, which is about all these javascripts can do, but that's
pretty much it. Anyone who really wants your content can and will find a way
around it.
Hope this helps,
Mark Fitzpatrick
Microsoft MVP - FrontPage