// preload images
function preload(imgObj,imgSrc) {
	if (document.images) {
		eval(imgObj+' = new Image()')
		eval(imgObj+'.src = "'+imgSrc+'"')
	}
}

// image flipper
function changeImage(layer,imgName,imgObj) {
	if (document.images) {
		if (document.layers && layer!=null) eval('document.'+layer+'.document.images["'+imgName+'"].src = '+imgObj+'.src')
		else document.images[imgName].src = eval(imgObj+".src")
	}
}

<!--
preload('bg','images/bg.gif');
preload('bg2','images/green-dian.gif');
preload('t','images/t.gif');
preload('l','images/l.gif');
preload('r','images/r.gif');
preload('copyright','images/copyright.gif');
preload('j1','images/j-1.gif');
preload('j2','images/j-2.gif');
preload('j3','images/j-3.gif');
preload('j4','images/j-4.gif');
preload('bt','images/b-t.gif');
preload('bl','images/b-l.gif');
preload('br','images/b-r.gif');
preload('bb','images/b-b.gif');

preload('screen0','images/art81-logo-on.gif');
preload('galleryoff','images/gallery.gif');
preload('newsoff','images/news.gif');
preload('aboutusoff','images/aboutus.gif');
preload('contactoff','images/contact.gif');
preload('designoff','images/design.gif');
preload('servicesoff','images/services.gif');
preload('friendsoff','images/friends.gif');
preload('linksoff','images/links.gif');

preload('galleryon','images/gallery-on.gif');
preload('newson','images/news-on.gif');
preload('aboutuson','images/aboutus-on.gif');
preload('contacton','images/contact-on.gif');
preload('designon','images/design-on.gif');
preload('serviceson','images/services-on.gif');
preload('friendson','images/friends-on.gif');
preload('linkson','images/links-on.gif');

preload('screenoff','images/art81-logo-on.gif');
preload('screen1','images/design-screen.gif');
preload('screen2','images/gallery-screen.gif');
preload('screen3','images/services-screen.gif');
preload('screen4','images/aboutus-screen.gif');
preload('screen5','images/contact-screen.gif');
preload('screen6','images/friends-screen.gif');
preload('screen7','images/news-screen.gif');
preload('screen8','images/links-screen.gif');