function changeDiapositiva(imgNew,id_evento) {
	document.getElementById("img_big").src = "download.php?tabella=1&campo="+imgNew+"&id="+id_evento;
	for(i=1;i<6;i++) {
		if(document.getElementById("img"+i)) document.getElementById("img"+i).style.border="2px solid #ffffff";
	}
	document.getElementById(imgNew).style.border="2px solid #bd1402";
}