vincevincevince - 8:15 am on Jun 26, 2006 (gmt 0) Top Tip
<body oncontextmenu="return false">
Just a note that this stops right-clicking but has no bearing upon the clipboard (as incorrectly stated above). It's also a very very annoying thing to do as the context menu is used for many tools other than copying your code.
Untick the box for 'disable or replace context menus'