if (document.images) {
nav1a = new Image();
nav1a.src = "images/nav_channels.png";
nav1b = new Image();
nav1b.src = "images/nav_channels_on.png";

nav2a = new Image();
nav2a.src = "images/nav_episodes.png";
nav2b = new Image();
nav2b.src = "images/nav_episodes_on.png";

nav3a = new Image();
nav3a.src = "images/nav_trailers.png";
nav3b = new Image();
nav3b.src = "images/nav_trailers_on.png";	

nav4a = new Image();
nav4a.src = "images/nav_podcasts.png";
nav4b = new Image();
nav4b.src = "images/nav_podcasts_on.png";

nav5a = new Image();
nav5a.src = "images/nav_browse.png";
nav5b = new Image();
nav5b.src = "images/nav_browse_on.png";

nav6a = new Image();
nav6a.src = "images/nav_shows.png";
nav6b = new Image();
nav6b.src = "images/nav_shows_on.png";

<!-- VIDEO PLAYER -->
vid1a = new Image();
vid1a.src = "images/player/lights.png";
vid1b = new Image();
vid1b.src = "images/player/lights_on.png";

vid2a = new Image();
vid2a.src = "images/player/friend.png";
vid2b = new Image();
vid2b.src = "images/player/friend_on.png";

vid3a = new Image();
vid3a.src = "images/player/link.png";
vid3b = new Image();
vid3b.src = "images/player/link_on.png";




} 

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

}}}