boltOn = new Image(); boltOn.src='/img/nav-bolt.gif';

function navOver(object) {
 document.getElementById(object).src = boltOn.src;
 showMenu(object);
}

function navOut(object) {
 if (document.getElementById('dd_'+object))
  preHide(object);
 else
  document.getElementById(object).src = '/img/blank.gif';
}

var show = new Array();
show['lighting']=0;
show['about']=0;

function showMenu(object) {
 hideAll(object);
 if (document.getElementById('dd_'+object)) {
  show[object]=1;
  document.getElementById('dd_'+object).style.visibility='visible';
 }
}

function hideMenu(object) {
 if (document.getElementById('dd_'+object) && show[object]==0) {
  document.getElementById(object).src = '/img/blank.gif';
  document.getElementById('dd_'+object).style.visibility='hidden';
 }
}

function preHide(object) {
 if (show[object]) {
  show[object]=0;
  setTimeout("hideMenu('"+object+"')",1000);
 }
}

function hideAll(object) {
 if (object!="lighting") {
  show['lighting']=0;
  hideMenu('lighting');
 }
 if (object!="about") {
  show['about']=0;
  hideMenu('about');
 }
}