AltaVista is simple to "crack"...but because me, and millions of others, are paying for our ISP's i won't tell you how. I think you should be happy (since you don't like to pay for things) that Altavista provides a service like that at no charge b/c if you start finding ways to avoid the banner adds they will make it more difficult on everyone else that uses their service.
Yes...i'am a bit** tonight...sorry.

D!m

PS. No coding is involved in bypassing the adds.