// 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('jinzioff','images/jinzi.jpg');
preload('linlinoff','images/linlin.jpg');

preload('jinzion','images/jinzion.gif');
preload('linlinon','images/linlinon.gif');

preload('screenjinzi','images/jinzilogo.jpg');
preload('screenlinlin','images/linlinlogo.jpg');