For anyone who really wants to take information off your page, with the right tools there is no way to stop them; at one point or another, the data comes from your website onto the clients computer, images, everything. It's physically impossible to stop a professional from viewing/taking publically accessible information, but preventing right-click should be sufficent to stop newbies.
Otherwise, you could create a custom menu on top of the page using one of this website's script resources and launch the website in a popup, although this can be seen as bad web design.
Generally, when a website restricts right-click or highlighting, it becomes extremely irritating for a user, if they want to just copy a piece of useful text.
You could consider just putting a Copyright notice there instead to cover yourself?
Short answer: Its impossible.
(btw, no-right-click scripts are easily defeated using Firefox and the "Allow Right Click" extension. Just to let you know, in case you want a different way to protect images etc.)
Hope this helps.
cr3ative