function chg_photo(id, id_dest) {
	var photo_src = document.getElementById(id);
	var photo_dst = document.getElementById(id_dest);
	var tmp = photo_dst.src;
	photo_dst.src = photo_src.src;
	photo_src.src = tmp;
}

function chg_lien(id, id_dest) {
	var photo_src = document.getElementById(id);
	var lien_dst = document.getElementById(id_dest);	
	lien_dst.href = photo_src.src.replace("m2","");
}