function popup(rif) {
var vers = "";
for (var i=1; i<popup.arguments.length; i++) {
  s=popup.arguments[i].replace("/ /g", "+");
  vers = vers + '&versioni[]=Nuova Riveduta';
}
finpopup = window.open('http://www.laparola.net/testop.php?riferimento='+rif+vers,'popup','height=450,width=550,resizable=1,scrollbars=1');
finpopup.focus();
}