$(document).ready(function(){
		var name_old;
		var name_new;

		$('.sub_menu img').hover(
			function(){
				name_old = $(this).attr('name');
				name_new=name_old;
				name=webroot+'img/over_'+name_old;
				$(this).attr('src',name);
				
			}, 
			function(){
				active = $(this).parent('a').parent('li').attr('class');
				if(active =='active'){

				}else{
					name_new=webroot+'img/'+name_new;
					$(this).attr('src',name_new);
				}
			});
		
		name_old = $('.sub_menu li.active').children('a').children('img').attr('name');
		
		name_new=webroot+'img/over_'+name_old;
		$('.sub_menu li.active img').attr('src',name_new);
});