Oh its all doable, heck you can even have right-click windows that pop up and say "no right clicking!" [img]tongue.gif[/img]
That's not all though! You can also have Java-based file menues that come up and such... Here are a few scripts you could use:
http://dynamicdrive.com/dynamicindex9/noright3.htm
No Popup warning
http://dynamicdrive.com/dynamicindex9/noright.htm
With a popup warning
http://dynamicdrive.com/dynamicindex...menu/index.htm
Which creates its own little awesome menue