function verify(f) {
  if(!f.kto.value){
    alert('Please enter your name.') ;
    f.kto.focus() ;
    return false ;
  }
  if(f.adres.value) {
    if(!f.adres.value.match(/^[^\(\)\<\>\;\:\,\ \"\'\[\]]+\@[^\(\)\<\>\;\:\,\ \"\'\[\]\.]+\.[^\(\)\<\>\;\:\,\ \"\'\[\]]+$/)) {
      alert('An email address that you entered is incorrect.') ;
      f.adres.focus() ;
      return false ;
    }
  } else {
    alert('Please enter your email address.') ;
    f.adres.focus() ;
    return false ;
  }
  if(!f.tytul.value){
    alert('Please enter a title.') ;
    f.tytul.focus() ;
    return false ;
  }
  if(!f.tresc.value){
    alert('Please enter your message.') ;
    f.tresc.focus() ;
    return false ;
  }      
return true;
}