Your issue is not clear to me.If your code want to change image on focus on image then it should work with this.
<html>
<script type="text/javascript">
function change_img() {
document.images.img1.src = "https://stackoverflow.com/questions/13914381/image1.jpg";
}
function change_back() {
document.images.img1.src = "image2.jpg";
}
</script>
<img
name="img1"
src="image2.jpg"
alt="gezi"
onMouseout="change_back()"
onMouseover="change_img()" />
</html>
solved Javascript function not working in IE [closed]