if (document.images) {

  var productsoff = new Image();
  var new_productsoff = new Image();
  var drawingoff = new Image();
  var newcatalogoff = new Image();
  var downloadsoff = new Image();
  var photooff = new Image();
  var searchoff = new Image();
  var aboutoff = new Image();
  var faqsoff = new Image();
  var contactusoff = new Image();
  var reqcatoff = new Image();
  var cdreqoff = new Image();

  var productson = new Image();
  var new_productson = new Image();
  var drawingon = new Image();
  var newcatalogon = new Image();
  var downloadson = new Image();
  var photoon = new Image();
  var searchon = new Image();
  var abouton = new Image();
  var faqson = new Image();
  var contactuson = new Image();
  var reqcaton = new Image();
  var cdreqon = new Image();

  productsoff.src = "images/buttons/products_off.gif";
  new_productsoff.src = "images/buttons/new_products_off.gif";
  drawingoff.src = "images/buttons/drawing_off.gif";
  newcatalogoff.src = "images/buttons/newcatalog_off.gif";
  downloadsoff.src = "images/buttons/downloads_off.gif";
  photooff.src = "images/buttons/photo_off.gif";
  searchoff.src = "images/buttons/search_off.gif";
  aboutoff.src = "images/buttons/about_off.gif";
  faqsoff.src = "images/buttons/faqs_off.gif";
  contactusoff.src = "images/buttons/contactus_off.gif";
  reqcatoff.src = "images/buttons/new_reqcat_off.gif";
  cdreqoff.src = "images/buttons/new_cdreq_off.gif";

  productson.src = "images/buttons/products_on.gif";
  new_productson.src = "images/buttons/new_products_on.gif";
  drawingon.src = "images/buttons/drawing_on.gif";
  newcatalogon.src = "images/buttons/newcatalog_on.gif";
  downloadson.src = "images/buttons/downloads_on.gif";
  photoon.src = "images/buttons/photo_on.gif";
  searchon.src = "images/buttons/search_on.gif";
  abouton.src = "images/buttons/about_on.gif";
  faqson.src = "images/buttons/faqs_on.gif";
  contactuson.src = "images/buttons/contactus_on.gif";
  reqcaton.src = "images/buttons/new_reqcat_on.gif";
  cdreqon.src = "images/buttons/new_cdreq_on.gif";
}

var isMenuAct = false;

function actMenuItem(imgName) {
  isMenuAct = true; // the menu is now active
  act(imgName);
}

function inactMenuItem(imgName) {
  isMenuAct = false; 
  if (document.images) {
    inact(imgName);
    timerID = setTimeout('if (!isMenuAct) act("' +  defImg + '")', 1);
  }
}

function act(imgName) {
  if (document.images) 
    document[imgName].src = eval(imgName + "on.src");
}

function inact(imgName) {
  if (document.images)
    document[imgName].src = eval(imgName + "off.src");
}