if (document.images) {

var home_up = new Image();
home_up.src = "images/nav/home.jpg";
var home_over = new Image();
home_over.src = "images/nav/home_over.jpg";

 
var aboutus_up = new Image();
aboutus_up.src = "images/nav/aboutus.jpg";
var aboutus_over = new Image();
aboutus_over.src = "images/nav/aboutus_over.jpg";


var reps_up = new Image();
reps_up.src = "images/nav/reps.jpg";
var reps_over = new Image();
reps_over.src = "images/nav/reps_over.jpg";

var cfeatures_up = new Image();
cfeatures_up.src = "images/nav/cfeatures.jpg";
var cfeatures_over = new Image();
cfeatures_over.src = "images/nav/cfeatures_over.jpg";

var exhibits_up = new Image();
exhibits_up.src = "images/nav/exhibits.jpg";
var exhibits_over = new Image();
exhibits_over.src = "images/nav/exhibits_over.jpg";


var rooms_up = new Image();
rooms_up.src = "images/nav/rooms.jpg";
var rooms_over = new Image();
rooms_over.src = "images/nav/rooms_over.jpg";

var contactus_up = new Image();
contactus_up.src = "images/nav/contactus.jpg";
var contactus_over = new Image();
contactus_over.src = "images/nav/contactus_over.jpg";

var collections_up = new Image();
collections_up.src = "images/nav/collections.jpg";
var collections_over = new Image();
collections_over.src = "images/nav/collections_over.jpg";
}


function home_over_button() {
if (document.images) {
 document["home"].src = home_over.src;
  }
}
function home_up_button() {
  if (document.images) {
    document["home"].src = home_up.src;
  }
}

function aboutus_over_button() {
if (document.images) {
 document["aboutus"].src = aboutus_over.src;
  }
}
function aboutus_up_button() {
  if (document.images) {
    document["aboutus"].src = aboutus_up.src;
  }
}
function reps_over_button() {
if (document.images) {
 document["reps"].src = reps_over.src;
  }
}
function reps_up_button() {
  if (document.images) {
    document["reps"].src = reps_up.src;
  }
}
function rooms_over_button() {
if (document.images) {
 document["rooms"].src = rooms_over.src;
  }
}
function rooms_up_button() {
  if (document.images) {
    document["rooms"].src = rooms_up.src;
  }
}

function cfeatures_over_button() {
if (document.images) {
 document["cfeatures"].src = cfeatures_over.src;
  }
}
function cfeatures_up_button() {
  if (document.images) {
    document["cfeatures"].src = cfeatures_up.src;
  }
}

function exhibits_over_button() {
if (document.images) {
 document["exhibits"].src = exhibits_over.src;
  }
}
function exhibits_up_button() {
  if (document.images) {
    document["exhibits"].src = exhibits_up.src;
  }
}

function collections_over_button() {
if (document.images) {
 document["collections"].src = collections_over.src;
  }
}
function collections_up_button() {
  if (document.images) {
    document["collections"].src = collections_up.src;
  }
}

function contactus_over_button() {
if (document.images) {
 document["contactus"].src = contactus_over.src;
  }
}
function contactus_up_button() {
  if (document.images) {
    document["contactus"].src = contactus_up.src;
  }
}