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

function changeImage(layer,imgName,imgObj) {
	if (document.layers && layer!=null) eval('document.'+layer+'.document.images["'+imgName+'"].src = '+imgObj+'.src');
	else document.images[imgName].src = eval(imgObj+".src");
}
preload('image1a','images/btnHome.gif');
preload('image1b','images/btnHome2.gif');
preload('image2a','images/btnBrowseProducts.gif');
preload('image2b','images/btnBrowseProducts2.gif');
preload('image3a','images/btnSpecialOffers.gif');
preload('image3b','images/btnSpecialOffers2.gif');
preload('image4a','images/btnMyShoppingCart.gif');
preload('image4b','images/btnMyShoppingCart2.gif');
preload('image5a','images/btnOrderStatus.gif');
preload('image5b','images/btnOrderStatus2.gif');
preload('image6a','images/btnGeneralInformation.gif');
preload('image6b','images/btnGeneralInformation2.gif');