function popup(nom,source,w,h){
	var popup = document.getElementById('popup');
	var fermer = document.getElementById('fermer');
	if (popup) {
		popup.style.display='block';
		popup.style.width=w+"px";
		popup.style.height=h+"px";
		document.images[nom].src='userfiles/file/presse/'+source;
	};
	if (popup) {fermer.onclick = function() {popup.style.display = 'none';};};
}