var browserOK = true;
var pics = new Array();
var objCount = 0;

function preload(name, first, second) {
  if (browserOK) {
    pics[objCount] = new Array(3);
    pics[objCount][0] = new Image();
    pics[objCount][0].src = first;
    pics[objCount][1] = new Image();
    pics[objCount][1].src = second;
    pics[objCount][2] = name;
    objCount++;
  }
}

function on(name){
  if (browserOK) {
     for (i = 0; i < objCount; i++) {
      if (document.images[pics[i][2]] != null)
        if (name != pics[i][2]) {
          document.images[pics[i][2]].src = pics[i][0].src;
        } else {
           document.images[pics[i][2]].src = pics[i][1].src;
        }
    }
  }
}

function off(){
  if (browserOK) {
     for (i = 0; i < objCount; i++) {
      if (document.images[pics[i][2]] != null)
        document.images[pics[i][2]].src = pics[i][0].src;
    }
  }
}

// preload images
preload("home", "images/TopNav/home.png", "images/TopNav/homeOn.png");
preload("music", "images/TopNav/music.png", "images/TopNav/musicOn.png");
preload("tv-show", "images/TopNav/tv-show.png", "images/TopNav/tv-showOn.png");
preload("magazine", "images/TopNav/magazine.png", 
  "images/TopNav/magazineOn.png");
preload("store", "images/TopNav/store.png", "images/TopNav/storeOn.png");
preload("about", "images/TopNav/about.png", "images/TopNav/aboutOn.png");
preload("contact", "images/TopNav/contact.png", "images/TopNav/contactOn.png");

// preload non-nav png's
preload("search", "images/search.png", '');
preload("search", "images/LeftFeatureBgSm.png", '');
preload("search", "images/plus.png", '');
preload("search", "images/SponsorBg.png", '');
preload("search", "images/search.png", '');