function addLoadListener(fn){
if(typeof window.addEventListener !='undefined'){
window.addEventListener('load',fn,false)}
else if(typeof document.addEventListener !='undefined'){
document.addEventListener('load',fn,false)}
else if(typeof window.attachEvent !='undefined'){
window.attachEvent('onload',fn)}
else{
var oldfn=window.onload
if(typeof window.onload !='function'){
window.onload=fn}
else{
window.onload=function(){
oldfn()
fn()}}}}
function preloadImages(){
var button=document.getElementById('submit')
var img=document.getElementById('searchImage')
var newImg=new Image()
newImg.src='images/search-over.gif'
button.onmouseover=function(){
img.src=newImg.src
img.style.cursor='hand'}
button.onmouseout=function(){
img.src='images/search.gif'}}
addLoadListener(preloadImages)