15. The method as set forth in claim 13 , wherein outputting the advertisement in the virtual world comprises executing at least one ad script included in the ad definition data.
15. The method as set forth in claim 13 , wherein outputting the advertisement in the virtual world comprises executing at least one ad script included in the ad definition data. 16. The method as set forth in claim 15 , further comprising: continuing to render the virtual world after the at least one ad script has been executed.