You can disable it by putting this code in the page(s) you want to protect, but it only works if they have JS enabled. If they really want to take your stuff it won't be difficult.
Code:
<script language=JavaScript>if (document.all) document.body.onmousedown=new Function("if (event.button==2||event.button==3)alert('Sorry, right click is disabled here!')")</script>
I've seen services that actually work to protect your site from scraping, but you have to pay for them and I can't remember any off the top of my head.
