if (document.images) {
	var portal_url = "http://www.nczoo.com";
	imageNames = new Array ("home","about","news","events","visit","members","conservation","contact","sub_join","sub_adoptadv","sub_plangive","sub_adopt","sub_give","printer_friendly","email_page","member_login");
  	onImages = new Array (imageNames.length);

	for (n = 0; n < imageNames.length; n++) {
		onImages[n] = new Image();
		onImages[n].src = portal_url + "/graphics/nav/" + imageNames[n] + "_on.gif";
	}

}
function navOn (name) {
	if ( document.images ) {
		document.images[name].src = portal_url + "/graphics/nav/" + name + "_on.gif";
	}
}

function navOff (name) {
	if ( document.images ) {
		document.images[name].src = portal_url + "/graphics/nav/" + name + "_off.gif";
	}
}