var projectsSubNavShown = false;

Event.observe(window, 'load', setProjecstSubNavStatus);

function setProjecstSubNavStatus() {
    projectsSubNavShown = $('projects_sub_nav').style.display != 'none';
}

function expandProjectsNavigation() {
    if (!projectsSubNavShown) {
        projectsSubNavShown = true;
        Effect.BlindDown('projects_sub_nav', { duration: .6 });
    }
    else {
        projectsSubNavShown = false;
        Effect.BlindUp('projects_sub_nav', { duration: .6 });
    }
}