function checkSessionName(lang) {
    if(typeof lang == 'undefined') { var lang = ''; }
    $('session_name_spinner').style.display = 'inline';
    ajax('session_name','lang='+ lang +'&name='+ $('session_name').value,'name_div');
}

function addSession(lang) {
    if(typeof lang == 'undefined') { var lang = ''; }
    var text1 = '. The session name must be at least six characters long\n',
        text2 = '. You must supply your email\n',
        text3 = 'Continue with no session description?';
        
    if(lang === 'da/') {
      text1 = '. Sessions-navnet skal være på mindst seks tegn\n';
      text2 = '. Du skal angive din email adresse\n';
      text3 = 'Fortsæt uden sessions-beskrivelse?';
    }
    
    $('add_submit').blur();
    i = 0;
    error = '';
    name = $('session_name').value;
    email = $('email').value;
    desc = $('session_desc').value;
    if(name.length < 4) { i++; error += i + text1; }
    if(!email.length) { i++; error += i + text2; }
    if(i) {
        alert(error);
        return false;
    }
    if(!desc.length && !confirm(text3)) { return false; }
    $('add_submit').style.display = 'none';
    $('add_spinner').style.display = 'inline';
}