var NavigationBar =
{
    toggleGroup : function(groupID)
    {
        var groupSubMenu = document.getElementById(groupID + "_SubMenu");
        var groupMenuBullet = document.getElementById(groupID + "_MenuBullet");
        var groupMenuSeperator = document.getElementById(groupID + "_MenuSeperator");
        
        var groupDisplayed = groupSubMenu.style.display == "";
        
        groupSubMenu.style.display = groupDisplayed ? "none" : "";
        groupMenuBullet.src = groupDisplayed ? groupMenuBullet.src.replace("02_down.gif", "02.gif") : groupMenuBullet.src.replace("02.gif", "02_down.gif");
        
        if (groupMenuSeperator != null)
            groupMenuSeperator.style.display = groupDisplayed ? "none" : "";
    }
}