function floatImages() {
	$A(document.getElementsByAttribute('align', 'right', 'img', 'content')).each(function(element) {
		Element.addClassName(element, 'nested-right');
	});
	$A(document.getElementsByAttribute('align', 'left', 'img', 'content')).each(function(element) {
		Element.addClassName(element, 'nested-left');
	});	
}

Event.observe(window, 'load', floatImages, false);