function show(nav) {
   activeNav = document.getElementById(nav);
   activeIframe = document.getElementById(nav+"-iframe");
   clearTimeout(activeNav.interval);
   display(nav, 'block');
   clearTimeout(activeIframe.interval);
   display(nav+"-iframe", 'block');
}

function hide(nav) {
   activeNav = document.getElementById(nav);
   activeIframe = document.getElementById(nav+"-iframe");
   func = "display('" + nav + "', 'none')";
   activeNav.interval = setTimeout(func, 100);
   funcIframe = "display('" + nav+"-iframe" + "', 'none')";
   activeIframe.interval = setTimeout(funcIframe, 100);
}

function display(nav, status) {
   activeNav = document.getElementById(nav);
   clearTimeout(activeNav.interval);
   activeNav.style.display = status;
}