This is popular question asked in many tech forums / QA pages.
Simplest way to turn Off the Right Click is
Add the atttibute onContextMenu = “return false”
<body onContextMenu=”return false”>
Tested this on
IE 5.0 and above / Firefox 2.0 and above.
PS: This doesn’t alert users with any warning or error messages when they right click. By warning them we dont want to rub their ego to find a solution.