// Format: Link - Image - Alt Text
var ads = [
	["https://www.aacreditunion.org/cardloans-visa.asp", "advertisement.jpg", "Learn more about a Visa Platinum Rewards Credit Card"],
	["link.html", "advertisement-1.jpg"]
];
var specials = [
	["https://www.aacreditunion.org/investins-gap.asp", "guaranteed-asset.jpg", "Learn more about Guaranteed Asset Protection"]
];

var showAd = function (type) {
	var adArray = type == 'ad'?ads:specials;
	var adDiv = type == 'ad'?document.getElementById('advertisement'):document.getElementById('specials');
	var randNum = Math.floor(Math.random()*(adArray.length));
	var adLink = document.createElement('a');
	adLink.href = adArray[randNum][0];
	adLink.target = "external";
	var adImg = document.createElement('img');
	adImg.src = "img/" + adArray[randNum][1];
	adLink.appendChild(adImg);
	adDiv.appendChild(adLink);	
}