if (document.images) { 
	agentson = new Image(); agentson.src = "../graphics/nav/agents-over.jpg";
	searchon = new Image(); searchon.src = "../graphics/nav/search-over.jpg";
	linksson = new Image(); linksson.src = "../graphics/nav/links-over.jpg";
	abouton = new Image(); abouton.src = "../graphics/nav/about-over.jpg";
	contacton = new Image(); contacton.src = "../graphics/nav/contact-over.jpg";

	agentsoff = new Image(); agentsoff.src = "../graphics/nav/agents-off.jpg";
	searchoff = new Image(); searchoff.src = "../graphics/nav/search-off.jpg";
	linkssoff = new Image(); linkssoff.src = "../graphics/nav/links-off.jpg";
	aboutoff = new Image(); aboutoff.src = "../graphics/nav/about-off.jpg";
	contactoff = new Image(); contactoff.src = "../graphics/nav/contact-off.jpg";
}

function imgOn(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName + "on.src");
	}
}

function imgOff(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName + "off.src");
	}
}