function imgMouseOverEvents(outString, overString, selector) {
	$$(selector).each(function(image) {
		image = $(image);
		if (image.hasClass('active'))
			{
			// set active
			if ($type(image.src)) image.src = image.src.replace(outString, overString);
			}
			
		if ($type(image.src)) {
			if (image.src.indexOf(outString) > 0) {
				image.addEvent('mouseenter',function(){
					image.src = image.src.replace(outString, overString);
				}).addEvent('mouseleave', function(){
					image.src = image.src.replace(overString, outString);
				});
			}
		}
	});
};

window.addEvent('domready', function() {

// enable rollovers
imgMouseOverEvents('_off', '_on', 'div#navigation img');

// open external links in new window
$$('a.external').each(function(el) { el.target = '_blank'; });


}); // end DOMREADY