function couleur_menu(p) {
	var spans=document.getElementsByTagName("li");
	n=spans.length;
	for(i=0;i<n;i++)
		{
			id= spans[i].id;
			if(id==p) {
				spans[i].id = 'it_on';
			}

		}			
}
function affiche_photo_thumb(play) {
	th="th-"+play;
	lrg="lrg-"+play;
	if (document.getElementById(th).style.display=='none'){
		document.getElementById(th).style.display='block';
		document.getElementById(lrg).style.display='none';
	}
	else {
		document.getElementById(th).style.display='none';
		document.getElementById(lrg).style.display='block';
	}
}