$(document).ready(function() {
		
	$("#tree_nav > .top_level > img").bind("click", function () {
		$(this).siblings(".branch_nav").slideToggle();
		if($(this).attr("src") == "http://images.oldhouseweb.com/bitmaps/nav_arrow_open.gif") {
			$(this).attr({src: "http://images.oldhouseweb.com/bitmaps/nav_arrow_closed.gif"});
		} else {
			$(this).attr({src: "http://images.oldhouseweb.com/bitmaps/nav_arrow_open.gif"});
		}
	});
});