function onlyDigits(e) {
if (e.which)
{ if(e.which!=46 && e.which!=8 && e.which!=9 && (e.which<48 || e.which>57))
  return false;
}
else if(e.keyCode)
     { if(e.keyCode!=46 && e.keyCode!=8 && e.keyCode!=9 && (e.keyCode<48 || e.keyCode>57))
       return false;
     }
return true;
}

function onlyLettere(e) {
if (e.which)
{ if(e.which!=46 && e.which!=8 && e.which!=9 && (e.which<65 || e.which>90) && (e.which<97 || e.which>122))
  return false;
}
else if(e.keyCode)
     { if(e.keyCode!=46 && e.keyCode!=8 && e.keyCode!=9 && (e.which<65 || e.which>90) && (e.which<97 || e.which>122))
       return false;
     }
return true;
}

function check_mail(mail)
{ var email_reg_exp = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-]{2,})+\.)+([a-zA-Z0-9]{2,})+/;

  if (!email_reg_exp.test(mail))
  { alert("Indirizzo e-mail non valido");
    return false;
  }
  else { return true; }
}

function popup(url, w, h) {
	var windowprops = "width=" + w + ",height=" + h;
	popup = window.open(url,'remote',windowprops);
}