function siteNavOver(e) {
	var elm = e.findElement('a');
	var img = elm.down('img');
	img.src = img.src.replace(/_off/, '_over');
}

function siteNavOut(e) {
	var elm = e.findElement('a');
	var img = elm.down('img');
	img.src = img.src.replace(/_over/, '_off');
}

/*
Event.observe(window, 'load', function() {
	$$('#site_navigation a').each(function(e) {
		Event.observe(e, 'mouseover', siteNavOver);
		Event.observe(e, 'mouseout', siteNavOut);
	});

	$$('#section_navigation a').each(function(e) {
		Event.observe(e, 'mouseover', siteNavOver);
		Event.observe(e, 'mouseout', siteNavOut);
	});
});
*/