<!--- 
if (document.images) {

var img1 = new Image();
img1.src = "/exhibitions/butterflies/images/nav/ex_highlights.gif"
var img1on = new Image();
img1on.src = "/exhibitions/butterflies/images/nav/ex_highlights2.gif"

var img2 = new Image();
img2.src = "/exhibitions/butterflies/images/nav/cams.gif"
var img2on = new Image();
img2on.src = "/exhibitions/butterflies/images/nav/cams2.gif"

var img3 = new Image();
img3.src = "/exhibitions/butterflies/images/nav/tickets.gif"
var img3on = new Image();
img3on.src = "/exhibitions/butterflies/images/nav/tickets2.gif"

var img4 = new Image();
img4.src = "/exhibitions/butterflies/images/nav/faq.gif"
var img4on = new Image();
img4on.src = "/exhibitions/butterflies/images/nav/faq2.gif"

var img5 = new Image();
img5.src = "/exhibitions/butterflies/images/nav/grow.gif"
var img5on = new Image();
img5on.src = "/exhibitions/butterflies/images/nav/grow2.gif"

var img6 = new Image();
img6.src = "/exhibitions/butterflies/images/nav/downloadable.gif"
var img6on = new Image();
img6on.src = "/exhibitions/butterflies/images/nav/downloadable2.gif"

var img7 = new Image();
img7.src = "/exhibitions/butterflies/images/nav/gallery.gif"
var img7on = new Image();
img7on.src = "/exhibitions/butterflies/images/nav/gallery2.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");}
} 

function tickon(name)  {
 if (document.images){
	document[name].src = eval(name + "on.src");}
}

function tickoff(name)  {
 if (document.images){
	document[name].src = eval(name + ".src");}
} 
//--->