//<![CDATA[ 
function Advertisement(type, url, alt_text, image_name)
{
	if (url)
		this._url = url;
	else
		this._url = "http://www.retrieverweekly.com/?module=displaysection&section_id=113&format=html";

	if (alt_text)
		this._alt_text = alt_text;
	else
		this._alt_text = "Advertise with us!";

	if (image_name)
		this._image_name = image_name
	else {
		if (type == "side")
			this._image_name = "side_ad_" + Math.floor(Math.random() * 3) + ".png";
		else
			this._image_name = "top_ad_" + Math.floor(Math.random() * 3) + ".png";
	}

}

function Top_Advertisement(url, alt_text, image_name)
{
	return new Advertisement("top", url, alt_text, image_name);
}

function Side_Advertisement(url, alt_text, image_name)
{
	return new Advertisement("side", url, alt_text, image_name);
}

Advertisement.prototype.display = function ()
{
	document.write('<a href="' + this._url + '" target="_blank" title="' + this._alt_text + '"><img src="http://www.retrieverweekly.com/ads/ad_images/' + this._image_name + '" alt="' + this._alt_text + '" border="0"></a>');
}

document.write('<script type="text/javascript" src="/ads/weekly_ads.js"></script>');

//]]>