function banner(a,b,c){this.url=a;this.loc=b;this.ref=c}
var banners = [
	new banner('http://www.testcountry.com/categories.html?cat=3&coupon=CONT5OFF&ref=TCBlog_Ads','http://hometestingblog.testcountry.com/advertising/substance-abuse.jpg','TCdotcom - Substance Abuse')
	,new banner('http://www.testcountry.com/categories.html?cat=57&coupon=CONT5OFF&ref=TCBlog_Ads','http://hometestingblog.testcountry.com/advertising/pregnancy.jpg','TCdotcom - Pregnancy')
	,new banner('http://www.testcountry.com/hormone_tool.asp?ref=TCBlog_Ads','http://hometestingblog.testcountry.com/advertising/hormone.jpg','TCdotcom - Hormone')
]

random_num = Math.floor(Math.random()*banners.length);
document.write('<span class="adtext"></span>');
document.write("<a target=\"_blank\" rel=\"nofollow\" onclick=\"pageTracker._trackEvent('Advertising','" + banners[random_num].ref + "');\" href=\"" + banners[random_num].url + "\"><img src=\"" + banners[random_num].loc +"\" border=\"0\" /></a>");
document.write('<span class="adtext"></span>');