if (document.images) {

var nav1 = new Image();
nav1.src = "/exhibitions/dioramas/common/images/bisonpronghorn_but_off.gif";
var nav1on = new Image();
nav1on.src = "/exhibitions/dioramas/common/images/bisonpronghorn_but_over.gif";

var nav2 = new Image();
nav2.src = "/exhibitions/dioramas/common/images/alaskabrownbear_but_off.gif";
var nav2on = new Image();
nav2on.src = "/exhibitions/dioramas/common/images/alaskabrownbear_but_over.gif";

var nav3 = new Image();
nav3.src = "/exhibitions/dioramas/common/images/alaskamoose_but_off.gif";
var nav3on = new Image();
nav3on.src = "/exhibitions/dioramas/common/images/alaskamoose_but_over.gif";

var nav4 = new Image();
nav4.src = "/exhibitions/dioramas/common/images/timberwolf_but_off.gif";
var nav4on = new Image();
nav4on.src = "/exhibitions/dioramas/common/images/timberwolf_but_over.gif";

var nav5 = new Image();
nav5.src = "/exhibitions/dioramas/common/images/mgoat_but_off.gif";
var nav5on = new Image();
nav5on.src = "/exhibitions/dioramas/common/images/mgoat_but_over.gif";

var nav6 = new Image();
nav6.src = "/exhibitions/dioramas/common/images/cuthbertrookery_but_off.gif";
var nav6on = new Image();
nav6on.src = "/exhibitions/dioramas/common/images/cuthbertrookery_but_over.gif";

var nav7 = new Image();
nav7.src = "/exhibitions/dioramas/common/images/uppernile_but_off.gif";
var nav7on = new Image();
nav7on.src = "/exhibitions/dioramas/common/images/uppernile_but_over.gif";

var nav8 = new Image();
nav8.src = "/exhibitions/dioramas/common/images/lion_but_off.gif";
var nav8on = new Image();
nav8on.src = "/exhibitions/dioramas/common/images/lion_but_over.gif";

var nav9 = new Image();
nav9.src = "/exhibitions/dioramas/common/images/mgorilla_but_off.gif";
var nav9on = new Image();
nav9on.src = "/exhibitions/dioramas/common/images/mgorilla_but_over.gif";


var tick1 = new Image();
tick1.src = "/common/content/images/but_buytickets_off.gif";
var tick1on = new Image();
tick1on.src = "/common/content/images/but_buytickets_on.gif";
}


function imgon(name)  {
if (document.images){
document[name].src = eval(name + "on.src");}
}

function imgoff(name)  {
if (document.images){
document[name].src = eval(name + ".src");}
}