var AdManager = {
	adMap: {},
	showInitialAd: function(adDiv, adContent) {
		this.adMap[adDiv] = adContent;
		document.writeln(adContent);
	},
	refreshAds: function() {
		for (var key in this.adMap) {
			var value = this.adMap[key];
			this._refreshAd(key, value);
		}
	},
	_refreshAd: function(divId, content) {
		try {
			var element = document.getElementById(divId);
			element.innerHTML = content;
		} catch(e) {
			// do nothing for now
		}
	},
	refreshAd: function(divId) {
		var element = document.getElementById(divId);
		element.innerHTML = adMap[divId];
	}
}
var adManager = AdManager;