$(function() {
	// preload nav mouseover images
	$('#links img').each(function() {
		var src = $(this).attr('src').match(/[^\.]+/) + '_over.png';
		var image = new Image();
		image.src = src;
	});
	
	// setup nav image swapping
	$('#links li:not(.current_page)').mouseover(function() {
		var image = $('img', this);
		var src = image.attr('src').match(/[^\.]+/) + '_over.png';
		image.attr('src', src);
	}).mouseout(function() {
		var image = $('img', this);
		var src = image.attr('src').replace('_over', '');
		image.attr('src', src);
	});
	
	// highlight current page in nav
	var currentPageNavImage = $('#links li.current_page img');
	currentPageNavImage.attr('src', currentPageNavImage.attr('src').match(/[^\.]+/) + '_over.png');
});