window.addEvent('domready', function(e){
	init_header();
	(function(){init_nav();}).delay(550);
	(function(){move_nav_line();}).periodical(1500);
});
function init_header(){
	var h = $('header_container');
	h.set('tween', {duration: 500});
	h.set('slide', {duration: 800, transition: Fx.Transitions.Expo.easeOut});
	h.fade('hide');
	h.fade('in');
}
function init_nav(){
	var nav_els = $('nav').getElements('.nav_item');
	nav_els.each(function(el){
		el.addEvent('mouseenter', function(){
			var active_els = $('nav').getElements('.active');
			active_els.each(function(ael){
				ael.removeClass('active');
			});
			el.addClass('active');
			move_nav_line();
		});
		el.addEvent('mouseleave', function(){
			el.removeClass('active');
			move_nav_line();
		});
	});
	move_nav_line();
}
function move_nav_line(){
	var line = $('nav_underline');
	var active_nav = ($('nav').getElement('.active')) ? $('nav').getElement('.active') : $('nav').getElement('.current');
	var is_current = active_nav.hasClass('current');
	if(active_nav){
		var size = active_nav.getSize();
		var pos = active_nav.getPosition();
		line.removeClass('active');
		line.morph({
			width: size.x + 2 +'px',
			height: '3px',
			left: pos.x - 1 + 'px',
			top: pos.y + size.y + 10 + 'px'
		});
	}
}