var RO_showSubmenu_visible = false;
function RO_showSubmenu(strMenu) {
  RO_showSubmenu_visible = (strMenu == "") ? false : true;
  var sm_bedrijven    = (strMenu == "bedrijven")    ? "show" : "hide";
  var sm_scholen      = (strMenu == "scholen")      ? "show" : "hide";
  var sm_overige      = (strMenu == "overige")      ? "show" : "hide";
  var sm_individueel  = (strMenu == "individueel")  ? "show" : "hide";
  MM_showHideLayers('sm_bedrijven','',sm_bedrijven,'sm_scholen','',sm_scholen,'sm_overige','',sm_overige,'sm_individueel','',sm_individueel);
}

function swapImageState(obj, state) {
  if (!obj || !obj.src) return;
  obj.src = obj.src.replace( /[dou]\.jpg$/, state + ".jpg" );
}


Event.observe(window, "load", function() {

  // Hide submenu on body mouseover
  Event.observe(document.body, "mouseover", function(event) {
    if (!RO_showSubmenu_visible) return;
    if (!event) event = window.event;
    var td = Event.findElement(event, "TD");
    if (!td || td.id != "tdMenu") {
      RO_showSubmenu('');
    }
  });

});