var gallery = ['boat', 'dogs', 'frog', 'jets', 'sand', 'sunflower', 'zebra'];
var images = [];
addEvent(window, 'load', function() {
	for (var i = gallery.length; i--;) {
		images[i] = new Image();
		images[i].src = 'http://p.webshots.net/images/grfk/grfk_gallery_' + gallery[i] + '.jpg';
	}
});
function gallerySwap(number) {
	$('gallery-image').src = images[number].src;
}