function changeImage() {
if (document.getElementById) {
document.getElementById("gallery").src="images/but-gallery_f2.jpg";
}
else if (document.all) {
document.all["gallery"].src="images/but-gallery_f2.jpg";
}
else if (document.layers) {
document.layers["gallery"].src="images/but-gallery_f2.jpg";
}
}