function preloadImages() {
	var aryPreload = new Array();
	var aryImages = Array(
		"images/nav_home_over.jpg",
		"images/nav_visitors_over.jpg",
		"images/nav_businesses_over.jpg",
		"images/nav_history_over.jpg",
		"images/nav_chamber_over.jpg",
		"images/nav_communities_over.jpg",
		"images/nav_contacts_over.jpg"
	);
	for (var i=0; i<aryImages.length; i++) {
		aryPreload[i] = new Image();
		aryPreload[i].src = aryImages[i];
	}
}

function showChild(element) {
	element.className = (element.className).replace(" showChild", "") + " showChild";
}

function hideChild(element) {
	element.className = (element.className).replace(" showChild", "");
}