function harenohi_logout(action, key, id)
{
    var logoutForm = document.createElement('form');
    logoutForm.id = 'harenohiLogoutForm';
    logoutForm.action = action;
    logoutForm.method = 'post';
    
    var mode = document.createElement('input');
    mode.type = 'hidden';
    mode.name = 'mode';
    mode.value = 'logout';
    
    var tid = document.createElement('input');
    tid.type = 'hidden';
    tid.name = key;
    tid.value = id;
    
    logoutForm.appendChild(mode);
    logoutForm.appendChild(tid);
    
    var body = document.getElementsByTagName('body').item(0);
    body.appendChild(logoutForm);
    
    logoutForm.submit();
}