function menu_link(t,id) {

if(document.getElementById('menu_box_'+id).style.display == '' || document.getElementById('menu_box_'+id).style.display == 'none') {
document.getElementById('menu_box_'+id).style.display = 'block';
return false;
}
if(document.getElementById('menu_box_'+id).style.display == 'block') {
document.getElementById('menu_box_'+id).style.display = 'none';
return false;
}

}

function newsletter_valid() {

var wiadomosc = '';
var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

if(!document.newsletter.newsletter_email.value) { wiadomosc += 'Podaj adres e-mail!\n'; }
else if (!filter.test(document.newsletter.newsletter_email.value)) { wiadomosc += 'Podaj poprawny adres e-mail!\n'; }

if(wiadomosc) { alert(wiadomosc); } else { window.open("newsletter.php?newsletter_email=" + document.newsletter.newsletter_email.value,'okno','width=600, height=500'); }

}

function newsletter_valid_delete() {

var wiadomosc = '';
var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

if(!document.newsletter.newsletter_email.value) { wiadomosc += 'Podaj adres e-mail!\n'; }
else if (!filter.test(document.newsletter.newsletter_email.value)) { wiadomosc += 'Podaj poprawny adres e-mail!\n'; }

if(wiadomosc) { alert(wiadomosc); } else { window.open("newsletter.php?action=delete&newsletter_email=" + document.newsletter.newsletter_email.value,'okno','width=600, height=500'); }

}