[jkd]

Just for educational purposes - disabling right click on all images in IE5+/Gecko using a different method:

Use this CSS:

img {
behavior: url(disablecontext.htc);
-moz-binding: url(disablecontext.xml#dis);
}

And save this as disablecontext.htc:

<PUBLIC:ATTACH event="oncontextmenu" onevent="disableIt()"/>
<script type="text/javascript">
function disableIt() {
event.returnValue = false;
event.cancelBubble = true;
alert('Right click on images disabled');
return false;
}
</script>

And this as disablecontext.xml:

<?xml version="1.0" encoding="UTF-8"?>
<bindings xmlns="http://www.mozilla.org/xbl">
	<binding id="dis">
		<handlers>
			<handler event="contextmenu" phase="capturing">
				event.stopPropagation();
				event.preventDefault();
				alert('Right click on images disabled');
				return false;
			</handler>
		</handlers>
	</binding>
</bindings>

Not that it'll do you any good, but at least this provides an interesting perspective on behaviors and bindings.

Note: Since the disabling of right click on images is done through CSS, this also includes any img's dynamically added to the document after page load, without relying on document-level events such as onmousedown. Which means other scripts can still make use of those events... preventing conflicts.