function bt_einblenden() {
    if ( $("bt_details") == null ) return;
    document.getElementById('bt_details').style.display  = 'block';
    document.getElementById('bt_showmore').style.display = 'none';
    document.getElementById('bt_showless').style.display = 'block';
}

function bt_ausblenden() {
    if ( $("bt_details") == null ) return;
    document.getElementById('bt_details').style.display  = 'none';
    document.getElementById('bt_showmore').style.display = 'block';
    document.getElementById('bt_showless').style.display = 'none';
}

function handle_feedback_form() {
    if ( document.location.hash == "#Feedback-Formular" ) {
        $("feedback_form_einblenden").childNodes[1].nodeValue = $("feedback_form_einblenden").childNodes[1].nodeValue.replace("ein", "aus");
        $("feedback_form").show();
    }
    $("feedback_form_einblenden").observe('click', function(event) {
        var element = event.findElement('a');
        if ( $("feedback_form").visible() == true ) {
            element.childNodes[0].src = "/mobil/bilder/p.gif";
            element.childNodes[1].nodeValue = element.childNodes[1].nodeValue.replace("aus", "ein");
            $("feedback_form").hide();
        }
        else {
            element.childNodes[0].src = "/mobil/bilder/m.gif";
            element.childNodes[1].nodeValue = element.childNodes[1].nodeValue.replace("ein", "aus");
            $("feedback_form").show();
        }
    });
}

var onload_before_hg_details = window.onload;
Event.observe(window, 'load', function() {
    if (onload_before_hg_details) { onload_before_hg_details(); }
    bt_ausblenden();
    handle_feedback_form();
});