function newImage(arg) {
  if (document.images) {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}

function changeImages() {
  if (document.images && (preloadFlag == true)) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
    }
  }
}

var preloadFlag = false;
function preloadImages() {
  if (document.images) {
    home_over = newImage("/images/nav/home-over.gif");
    home_click = newImage("/images/nav/home-click.gif");
    pi_over = newImage("/images/nav/pi-over.gif");
    pi_click = newImage("/images/nav/pi-click.gif");
    pi_cylreman_over = newImage("/images/nav/pi_cylreman-over.gif");
    pi_cylreman_click = newImage("/images/nav/pi_cylreman-click.gif");
    pi_engserv_over = newImage("/images/nav/pi_engserv-over.gif");
    pi_engserv_click = newImage("/images/nav/pi_engserv-click.gif");
    pi_remanpro_over = newImage("/images/nav/pi_remanpro-over.gif");
    pi_remanpro_click = newImage("/images/nav/pi_remanpro-click.gif");
    pi_capa_over = newImage("/images/nav/pi_capa-over.gif");
    pi_capa_click = newImage("/images/nav/pi_capa-click.gif");
    pi_open_over = newImage("/images/nav/pi_open-over.gif");
    pi_open_click = newImage("/images/nav/pi_open-click.gif");
    chemical_over = newImage("/images/nav/chemical-over.gif");
    chemical_click = newImage("/images/nav/chemical-click.gif");
    power_over = newImage("/images/nav/power-over.gif");
    power_click = newImage("/images/nav/power-click.gif");
    contract_over = newImage("/images/nav/contract-over.gif");
    contract_click = newImage("/images/nav/contract-click.gif");
    repair_over = newImage("/images/nav/repair-over.gif");
    repair_click = newImage("/images/nav/repair-click.gif");    
    about_over = newImage("/images/nav/about-over.gif");
    about_click = newImage("/images/nav/about-click.gif");
    contact_over = newImage("/images/nav/contact-over.gif");
    contact_click = newImage("/images/nav/contact-click.gif");
    preloadFlag = true;
  }
}

function openTour(url, name, w, h) {
  popupWin = window.open(url, name,'width=' + w + ',height=' + h);
}