window.addEvent('domready', function() {	
    var menuTimer;

    $('menu').setStyle('visibility','visible');
    $('menu').getElements('ul.sous_menu').setStyle('opacity',0);
    $('menu').getElements('ul.sous_menu').each(function(element){element.store('heightInitial',element.getStyle('height'));});
    $('menu').getElements('ul.sous_menu').setStyle('height',0);    
		
	$('menu').getElements('li.menu_item').addEvent('mouseenter',function(){        
        var element=this.getElement('ul.sous_menu');
        if(!element){return;}
      
        var morph=new Fx.Morph(element,{
            duration: 150,
            link: 'cancel'
        });
        
        $clear(menuTimer);
        
        menuTimer=(function(){
            morph.set({'opacity': 0.8});
            
            morph.start({
                'height': element.retrieve('heightInitial')
            })
        }).delay(100);
        
    });
    
    $('menu').getElements('li.menu_item').addEvent('mouseleave',function(){
        var element=this.getElement('ul.sous_menu');
        if(!element){return;}
  
        var morph=new Fx.Morph(element,{
            duration: 400,
            link: 'cancel'
        });
        
        $clear(menuTimer);
        
        morph.start({
            'height': 0,
            'opacity': 0
        });       
    });
});