$(document).ready(function () {   
      
    $('#navigation .menu li').hover(  
        function () {  
            //show its submenu  
            $('ul.child-menu-level1', this).css('display', 'block');  
  
        },   
        function () {  
            //hide its submenu  
            $('ul.child-menu-level1', this).css('display', 'none');        
        }  
    );  
      
});