$(document).ready(function(){
   $( '#main_menu > .js_actived > ul > li:not([class*="selected"])').hover(
    function(){
			$(this).addClass('hover');
			$('#main_menu .selected .submenu').hide();
    },
    function(){
			$(this).removeClass('hover');
			$('#main_menu .selected .submenu').show();
    }
  );
});