//Nav menu image preloads
NavImages = new Array();
NavImages[0] = "/App_Themes/Default/Images/tnav_getmapping-o.gif";
NavImages[1] = "/App_Themes/Default/Images/tnav_products-o.gif";
NavImages[2] = "/App_Themes/Default/Images/tnav_services-o.gif";
NavImages[3] = "/App_Themes/Default/Images/tnav_industries-o.gif";
NavImages[4] = "/App_Themes/Default/Images/tnav_about-o.gif";
NavImages[5] = "/App_Themes/Default/Images/tnav_support-o.gif";
NavImages[6] = "/App_Themes/Default/Images/tnav_contact-o.gif";
NavImages[7] = "/App_Themes/Default/Images/lnav_bg-o.gif";

function PreloadImages() {
  imageObj = new Image();
  for (i = 0; i <= NavImages.length; i++) {
    imageObj.src = NavImages[i]; //Fetch the images from the server into browser's cache
  }
}


//Nav menu mouse-over behaviour
var lastMenu = new Object();
function NavSubMOver() {
  if (!lastMenu != null) {
    NavMOver(lastMenu);
  }
}

function NavSubMOut() {
  if (!lastMenu != null) {
    NavMOut(lastMenu);
  }
}

function NavMOver(headerItem) {
  lastMenu = headerItem;
  headerItem.src = headerItem.src.replace('-a.gif', '-b.gif')
}

function NavMOut(headerItem) {
  headerItem.src = headerItem.src.replace('-b.gif', '-a.gif')
}