var niv1Actif = '';

$(window).load(function() {

	$('.niv1_li').mouseenter(function() {

		id = this.id.replace('niv1_li_', '');

		$('#niv2_mask_' + id).animate({
			opacity: 1,
			height: parseInt($('#niv2_ul_' + id).css('height')) + parseInt($('#niv2_ul_' + id).css('padding-top')) + parseInt($('#niv2_ul_' + id).css('padding-bottom'))
		}, 600, 'easeOutExpo');

	});

	$('.niv1_li').mouseleave(function() {

		id = this.id.replace('niv1_li_', '');

		$('#niv2_mask_' + id).animate({
			opacity: 0,
			height: 0
		}, 400, 'easeOutExpo');

	});

});