var ti;
var curmnu = "";

function showMenu(welke) {
 closeMenu();
 clearTimeout(ti);
 d = document.getElementById("midknopsubmenu"+welke);
 if (d) {
  d.style.display = "block";
  d = document.getElementById("midknop"+welke);
  d.className = "midknopover";
  curmnu = welke;
  ti = setTimeout(closeMenu, 2500);
 } else {
  clearTimeout(ti);
  closeMenu();
 }
}

function keepMenu() {
 clearTimeout(ti);
 ti = setTimeout(closeMenu, 2500);
}

function closeMenu() {
 d = document.getElementById("midknopsubmenu"+curmnu);
 if (d) {
  clearTimeout(ti);
  d.style.display="none";
  d = document.getElementById("midknop"+curmnu);
  d.className = "midknop";
 }
 curmnu = "";
}