function displayEffect(title) {
	//alert(class);
	if(title == 'expeditions')
		$('effects').setStyle('background-position', '-250px 0');
	else
		$('effects').setStyle('background-position', '0 0');
}
function removeEffect() {
	$('effects').setStyle('background-position', '-500px 0');
}

// Function for onmouseover and out in the naviguation.
function hoverEffects() {
	$$('#container').adopt(
		new Element('div').setStyles({
			position: 'absolute',
			background: 'url(/img/effects.jpg) -500px 0px no-repeat',
			top: 0,
			left: 0,
			width: 250,
			height: 500,
			BorderRadius: '20px'
		}).set('id', 'effects')
	);
	var elements = $$('#content .site_selection ul li.root');
	elements.each(function(el, i) {
		el.addEvent('mouseenter', function(e){
			displayEffect(el.getAttribute('title'));
		});
		el.addEvent('mouseleave', function(e){
			removeEffect();
		});
	});

	// rajoute à tous les éléments au survol la class .hover
	$$('*').each(function(el, i) {
		el.addEvent('mouseenter', function(e){
			el.addClass('hover');
		});
		el.addEvent('mouseleave', function(e){
			el.removeClass('hover');
		});
	});
	
	var bioLinks = $$('#content .site_selection ul li.bio ul li a');
	bioLinks.setStyle('display', 'none');
	$$('#content .site_selection ul li.bio').each(function(el, i) {
		el.addEvent('mouseenter', function(e){
			bioLinks.setStyle('display', 'block');
		});
		el.addEvent('mouseleave', function(e){
			bioLinks.setStyle('display', 'none');
		});
	});
/*
#content .site_selection ul li.expe.hover { 
	background: url('/img/white_025.png'); 
}#content .site_selection ul li.bio.hover span.txt.main { 
	display: none;
}#content .site_selection ul li.bio.hover ul li a { 
	display: block;
}
*/
}

window.addEvent('domready', hoverEffects);