function check_ksiega(form) {
  var p=0;

  if (form.wpis.value=="") { alert("Podaj treść wpisu."); form.wpis.focus(); p=1 }
  else if (form.who.value=="") { alert("Podaj Autora wpisu."); form.who.focus(); p=1 }

  
  if (p==0) { 
    return true; 
  } else { 
    return false; 
  }  
}

function check_email(email) {
  invalid = " /:,;";
  if(email == "") { return false }
  for(i=0; i < invalid.length; i++) {
    bad = invalid.charAt(i);
    if (email.indexOf (bad, 0) != -1) { return false }
  }
  at = email.indexOf("@", 0);
  if( (at == -1) || (at == 0) ) { return false }
  if(email.indexOf("@", at+1) != -1) { return false }
  period = email.indexOf(".", at);
  if( (period == -1) || (period == at+1) ) { return false }
  if(period+3 > email.length == -1) { return false }
  return true;
}

function check_biuletyn(form) {
  if (!(check_email(form.email_biuletyn.value))) {
    alert('Podaj poprawny adres e-mail.');
    form.email_biuletyn.focus();
    form.email_biuletyn.select();
    return false;
  } else {
    return true;
  }
}