function engrish(n) {
	if(n.nodeType == document.TEXT_NODE) {
		n.nodeValue = n.nodeValue.replace(/l/g, 'r').replace(/L/g, 'R');
	} else if(n.hasChildNodes()) {
		for(var i=0; i<n.childNodes.length; i++) {
			engrish(n.childNodes[i]);
		}
	}
}

To execute this code, simply call engrish(document.documentElement);. Using recursion this function goes through the DOM, finds text nodes and replaces the characters.

This is fine an dandy if you put this on your site so you can quickly convert your copy to engrish however there is something that you can do to turn any page into it’s engrish form. You can save this code as a bookmark

If you would like an example of what the bookmark URL would be, just engrish-ify this page and save the link as a bookmark (you can drag that link into your bookmark toolbar in Firefox