function getEl(el){
    return document.getElementById(el);
}

function send(){
    var ajax = new sack();
    ajax.setVar('name',  getEl('fb_name').value);
    ajax.setVar('email', getEl('fb_email').value);
    ajax.setVar('text',  getEl('fb_text').value);
    getEl('feedback').innerHTML = "<div id='fb_report'>отправка...</div>";
    ajax.method        = 'POST';
    ajax.requestFile   = '/feedback.php';
    ajax.element       = 'feedback';
    ajax.runAJAX();    
}

function toggle(){
    document.getElementById("feedback").style.display == "block" ? document.getElementById("feedback").style.display="none" : document.getElementById("feedback").style.display="block";
}