window.addEvent('domready', function() {


	//  effet de fading
	
	var ouverture = $('main_container').setStyles({display:'block', opacity:0});
	new Fx.Style('main_container', 'opacity', {duration:1000}).start(1);
	
	var lien = $('nav_main').getElements('a');
	
	lien.each(function(element) {
		var fx = new Fx.Styles('main_container', {duration:500, wait:true}, {transition: Fx.Transitions.Cubic.easeOut});
			element.addEvent('mousedown', function(){
				fx.start({
					opacity:0,
					'color': '#000'
				});
			});		
		});
	
});