function viewPhoto(img, zoom){
  var zoom = (zoom == null) ? 1 : zoom;
  foto1 = new Image();
  foto1.src = (img);
  largh=foto1.width * zoom;
  altez=foto1.height * zoom;
  stringa="width="+largh+",height="+altez;
	if (largh == 0) {
		setTimeout("viewFoto('"+img+"','"+zoom+"')",100);
	}else{
		finestra=window.open("/showimg.php?src="+img,"",stringa);
	}
}