if (document.images) {

var hnav1 = new Image();
hnav1.src = "/exhibitions/permanent/humanorigins/images/nav/hnav_1.gif";
var hnav1on = new Image();
hnav1on.src = "/exhibitions/permanent/humanorigins/images/nav/hnav_1_over.gif";

var hnav2 = new Image();
hnav2.src = "/exhibitions/permanent/humanorigins/images/nav/hnav_2.gif";
var hnav2on = new Image();
hnav2on.src = "/exhibitions/permanent/humanorigins/images/nav/hnav_2_over.gif";

var hnav3 = new Image();
hnav3.src = "/exhibitions/permanent/humanorigins/images/nav/hnav_3.gif";
var hnav3on = new Image();
hnav3on.src = "/exhibitions/permanent/humanorigins/images/nav/hnav_3_over.gif";

var hnav4 = new Image();
hnav4.src = "/exhibitions/permanent/humanorigins/images/nav/hnav_4.gif";
var hnav4on = new Image();
hnav4on.src = "/exhibitions/permanent/humanorigins/images/nav/hnav_4_over.gif";

var hnav5 = new Image();
hnav5.src = "/exhibitions/permanent/humanorigins/images/nav/hnav_5.gif";
var hnav5on = new Image();
hnav5on.src = "/exhibitions/permanent/humanorigins/images/nav/hnav_5_over.gif";

var hnav6 = new Image();
hnav6.src = "/exhibitions/permanent/humanorigins/images/nav/hnav_6.gif";
var hnav6on = new Image();
hnav6on.src = "/exhibitions/permanent/humanorigins/images/nav/hnav_6_over.gif";



var hunav1 = new Image();
hunav1.src = "/exhibitions/permanent/humanorigins/images/unav/resources_button.gif";
var hunav1on = new Image();
hunav1on.src = "/exhibitions/permanent/humanorigins/images/unav/resources_button_over.gif";

var hunav2 = new Image();
hunav2.src = "/exhibitions/permanent/humanorigins/images/unav/educators_button.gif";
var hunav2on = new Image();
hunav2on.src = "/exhibitions/permanent/humanorigins/images/unav/educators_button_over.gif";

var hunav3 = new Image();
hunav3.src = "/exhibitions/permanent/humanorigins/images/unav/map_button.gif";
var hunav3on = new Image();
hunav3on.src = "/exhibitions/permanent/humanorigins/images/unav/map_button_over.gif";

var hunav4 = new Image();
hunav4.src = "/exhibitions/permanent/humanorigins/images/unav/unav_visitor.gif";
var hunav4on = new Image();
hunav4on.src = "/exhibitions/permanent/humanorigins/images/unav/unav_visitor_over.gif";

var hunav5 = new Image();
hunav5.src = "/exhibitions/permanent/humanorigins/images/unav/unav_public.gif";
var hunav5on = new Image();
hunav5on.src = "/exhibitions/permanent/humanorigins/images/unav/unav_public_over.gif";

var hunav6 = new Image();
hunav6.src = "/exhibitions/permanent/humanorigins/images/unav/unav_behind.gif";
var hunav6on = new Image();
hunav6on.src = "/exhibitions/permanent/humanorigins/images/unav/unav_behind_over.gif";

var hunav7 = new Image();
hunav7.src = "/exhibitions/permanent/humanorigins/images/unav/unav_credits.gif";
var hunav7on = new Image();
hunav7on.src = "/exhibitions/permanent/humanorigins/images/unav/unav_credits_over.gif";

var hunav8 = new Image();
hunav8.src = "/exhibitions/permanent/humanorigins/images/unav/unav_sponsors.gif";
var hunav8on = new Image();
hunav8on.src = "/exhibitions/permanent/humanorigins/images/unav/unav_sponsors_over.gif";

var hunav9 = new Image();
hunav9.src = "/exhibitions/permanent/humanorigins/images/unav/unav_sackler_lab.gif";
var hunav9on = new Image();
hunav9on.src = "/exhibitions/permanent/humanorigins/images/unav/unav_sackler_lab_over.gif";

var nav1 = new Image();
nav1.src = "/exhibitions/permanent/humanorigins/common/images/nav/2nav_1.gif";
var nav1on = new Image();
nav1on.src = "/exhibitions/permanent/humanorigins/common/images/nav/2nav_1_over.gif";

var nav2 = new Image();
nav2.src = "/exhibitions/permanent/humanorigins/common/images/nav/2nav_2.gif";
var nav2on = new Image();
nav2on.src = "/exhibitions/permanent/humanorigins/common/images/nav/2nav_2_over.gif";

var nav3 = new Image();
nav3.src = "/exhibitions/permanent/humanorigins/common/images/nav/2nav_3.gif";
var nav3on = new Image();
nav3on.src = "/exhibitions/permanent/humanorigins/common/images/nav/2nav_3_over.gif";

var nav4 = new Image();
nav4.src = "/exhibitions/permanent/humanorigins/common/images/nav/2nav_4.gif";
var nav4on = new Image();
nav4on.src = "/exhibitions/permanent/humanorigins/common/images/nav/2nav_4_over.gif";

var nav5 = new Image();
nav5.src = "/exhibitions/permanent/humanorigins/common/images/nav/2nav_5.gif";
var nav5on = new Image();
nav5on.src = "/exhibitions/permanent/humanorigins/common/images/nav/2nav_5_over.gif";

var nav6 = new Image();
nav6.src = "/exhibitions/permanent/humanorigins/common/images/nav/2nav_6.gif";
var nav6on = new Image();
nav6on.src = "/exhibitions/permanent/humanorigins/common/images/nav/2nav_6_over.gif";

var navhome = new Image();
navhome.src = "/exhibitions/permanent/humanorigins/common/images/nav/2nav_home.gif";
var navhomeon = new Image();
navhomeon.src = "/exhibitions/permanent/humanorigins/common/images/nav/2nav_home_over.gif";

var unav1 = new Image();
unav1.src = "/exhibitions/permanent/humanorigins/images/unav/resources_button.gif";
var unav1on = new Image();
unav1on.src = "/exhibitions/permanent/humanorigins/images/unav/resources_button_over.gif";

var unav2 = new Image();
unav2.src = "/exhibitions/permanent/humanorigins/images/unav/educators_button.gif";
var unav2on = new Image();
unav2on.src = "/exhibitions/permanent/humanorigins/images/unav/educators_button_over.gif";

var unav3 = new Image();
unav3.src = "/exhibitions/permanent/humanorigins/images/unav/map_button.gif";
var unav3on = new Image();
unav3on.src = "/exhibitions/permanent/humanorigins/images/unav/map_button_over.gif";

var unav4 = new Image();
unav4.src = "/exhibitions/permanent/humanorigins/common/images/unav/2unav_visitor.gif";
var unav4on = new Image();
unav4on.src = "/exhibitions/permanent/humanorigins/common/images/unav/2unav_visitor_over.gif";

var unav5 = new Image();
unav5.src = "/exhibitions/permanent/humanorigins/common/images/unav/2unav_public.gif";
var unav5on = new Image();
unav5on.src = "/exhibitions/permanent/humanorigins/common/images/unav/2unav_public_over.gif";

var unav6 = new Image();
unav6.src = "/exhibitions/permanent/humanorigins/common/images/unav/2unav_behind.gif";
var unav6on = new Image();
unav6on.src = "/exhibitions/permanent/humanorigins/common/images/unav/2unav_behind_over.gif";

var unav7 = new Image();
unav7.src = "/exhibitions/permanent/humanorigins/common/images/unav/2unav_credits.gif";
var unav7on = new Image();
unav7on.src = "/exhibitions/permanent/humanorigins/common/images/unav/2unav_credits_over.gif";

var unav8 = new Image();
unav8.src = "/exhibitions/permanent/humanorigins/common/images/unav/2unav_sponsors.gif";
var unav8on = new Image();
unav8on.src = "/exhibitions/permanent/humanorigins/common/images/unav/2unav_sponsors_over.gif";

var unav9 = new Image();
unav9.src = "/exhibitions/permanent/humanorigins/images/unav/funfacts_button.gif";
var unav9on = new Image();
unav9on.src = "/exhibitions/permanent/humanorigins/images/unav/funfacts_button_over.gif";

var unav10 = new Image();
unav10.src = "/exhibitions/permanent/humanorigins/images/unav/shop_button.gif";
var unav10on = new Image();
unav10on.src = "/exhibitions/permanent/humanorigins/images/unav/shop_button_over.gif";

var unav11 = new Image();
unav11.src = "/exhibitions/permanent/humanorigins/common/images/unav/2unav_sackler_lab.gif";
var unav11on = new Image();
unav11on.src = "/exhibitions/permanent/humanorigins/common/images/unav/2unav_sackler_lab_over.gif";

var textnavnext = new Image();
textnavnext.src = "/exhibitions/permanent/humanorigins/common/images/next_button.gif"
var textnavnexton = new Image();
textnavnexton.src = "/exhibitions/permanent/humanorigins/common/images/next_button_over.gif"

var textnavback = new Image();
textnavback.src = "/exhibitions/permanent/humanorigins/common/images/back_button.gif"
var textnavbackon = new Image();
textnavbackon.src = "/exhibitions/permanent/humanorigins/common/images/back_button_over.gif"

var closewindow = new Image();
closewindow.src = "/exhibitions/permanent/humanorigins/common/images/close_button.gif"
var closewindowon = new Image();
closewindowon.src = "/exhibitions/permanent/humanorigins/common/images/close_button_over.gif"

var introvideo = new Image();
introvideo.src = "/exhibitions/lizards/images/intro_video.gif"
var introvideoon = new Image();
introvideoon.src = "/exhibitions/lizards/images/intro_video_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");}
}