Home User and System Preference Disable right mouse click Script II (on images) Developer's View
<html>
<body>
<script>
document.oncontextmenu = function(e){
var target = (typeof e !="undefined")? e.target: event.srcElement
if (target.tagName == "IMG" || (target.tagName == 'A' &&
target.firstChild.tagName == 'IMG'))
return false
}
</script>
</body>
</html>