$(function(){
	$('.mun_li ul').hide();
	$('.mun_li').hover(
		function(){
			var link = $(this).children('.mun_a');
			link.addClass('lt_line');
			var span = link.children('span');
			span.addClass('rt_line');
			var strong = span.children('strong');
			strong.addClass('bg_img');
			$(this).children('ul').show();
		},
		function(){
			var link = $(this).children('.mun_a');
			link.removeClass('lt_line');
			var span = link.children('span');
			span.removeClass('rt_line');
			var strong = span.children('strong');
			strong.removeClass('bg_img');			
			$(this).children('ul').hide();
		}
	);
});