Some of our antivirus products had a brief false alarm today. The alert was from a common JavaScript file called show_ads.js. The false alarm was for a trojan called Trojan.JS.Redirector.ar.
The false alarm has been fixed in our update 2010-01-25_17.
This only affected our older products, such as the 2009 product range. F-Secure Internet Security 2010 had no issues.