$(document).ready(function() {
	$('#navigation img').mouseover(function() {
		var t = $(this);
		t.attr('oldSrc', t.attr('src'));
		t.attr('src', '/images/nav/' + t.attr('rel') + '_mo.gif');
	}).mouseout(function() {
		var t = $(this);
		t.attr('src', t.attr('oldSrc'));
		t.removeAttr('oldSrc');
	});
});