var url_img = 'img/1999/big/';
var conteneur = 'contain_big';
var total = null;
/*
window.addEvent('domready', function() {
	total = $$('#vignettes img').length;
});
*/
function suivant(plus){
	var nom = check_name('big');
	
	(nom == 1) ? $('back').setOpacity(0) : $('back').setOpacity(1);
	(nom + 1 == total - 1) ? $('prochain').setOpacity(0) : $('prochain').setOpacity(1);

	if( !plus ) {
		nom--;		
	}else{		
		nom++;
	}	
	chng(nom);
}
function redim_div(src){
	var size = $('big').getCoordinates();
	var big_largeur = size.width+50;
	var big_hauteur = size.height+4;
	$('affiche_image').setStyles({
		'width': big_largeur,
		'height': big_hauteur
	});
	$('big').setStyle('margin-left','20px');
	$('back').setStyles({
		'top': (size.height/2)-10,
		'left': -5
	});
	$('prochain').setStyles({
		'top': (size.height/2)-10,
		'left': size.width+20
	});
	var hauteur = ( (800) - size.height )/2;
	var largeur = ( 1007 - size.width)/2;
	$('affiche_image').setStyles({
		'top': hauteur,
		'left': largeur
	});
}

function chng(src) {

	(src == 0) ? $('back').setOpacity(0) : $('back').setOpacity(1);
	(src == total - 1) ? $('prochain').setOpacity(0) : $('prochain').setOpacity(1);

	$("contain_big").style.visibility = 'visible';
	//$('big').setProperty('src', url_img+src+'.jpg');
	new Asset.image(url_img+src+'.jpg', {
		id: 'big',
		onload: function() {
			$('big').src = this.src;
			redim_div(this);
		}
	});

}

function check_name(calque){
	var nom = $(calque).src.split("/");
	nom = nom.reverse();
	nom = nom[0].split(".");
	return nom[0].toInt();
}