function MW_enhance_sitenav() {
	$("#sitenav a img").each( function() {
		var oldsrc = $(this).attr("src");
		var newsrc = oldsrc.replace("-off","-on");
		$("<img>").attr("src", newsrc);
	});
	
	$("#sitenav a").hover( function() {
		var oldsrc = $(this).find("img").attr("src");
		var newsrc = oldsrc.replace("-off","-on");
		$(this).find("img").attr("src",newsrc);
	}, function() {
		var oldsrc = $(this).find("img").attr("src");
		var newsrc = oldsrc.replace("-on","-off");
		$(this).find("img").attr("src",newsrc);
	});
}

$(document).ready( function() {
	MW_enhance_sitenav();
});