Usually when you work from home, you got a kid that similar with the Computer that you already use, so without you know, could be the kid will click your ads that save on your bookmark page, to avoid this you can use this methode to NOT display ads on your personal computer.
another way is using host on your operation system, on this case windows:
find first host based on your Grade OS
Windows XP: C:\WINDOWS\system32\drivers\etc
Windows 2000: C:\WINNT\system32\drivers\etc
Windows 98 or ME: C:\WINDOWS\
open it with right click[ you can use notepad or something like that]
you will see:
127.0.0.1 localhost
you can add below default entry the following item[ in this time we gonna block google adsense, google analytics, urchin and chitika]:
127.0.0.1 adwords.google.com #[Gmail ads]
127.0.0.1 pagead.googlesyndication.com
127.0.0.1 pagead2.googlesyndication.com #[Google AdWords]
127.0.0.1 syndicate.googlesyndication.com
127.0.0.1 syndicate2.googlesyndication.com
127.0.0.1 googlesyndication.com
127.0.0.1 adservices.google.com
127.0.0.1 syndicate.google.com
127.0.0.1 syndicate2.google.com
127.0.0.1 ssl.google-analytics.com
127.0.0.1 www.google-analytics.com #[Google Analytics]
127.0.0.1 google-analytics.com
127.0.0.1 imageads.googleadservices.com
127.0.0.1 imageads1.googleadservices.com
127.0.0.1 imageads2.googleadservices.com
127.0.0.1 imageads3.googleadservices.com
127.0.0.1 imageads4.googleadservices.com
127.0.0.1 imageads5.googleadservices.com
127.0.0.1 imageads6.googleadservices.com
127.0.0.1 imageads7.googleadservices.com
127.0.0.1 imageads8.googleadservices.com
127.0.0.1 imageads9.googleadservices.com
127.0.0.1 www.googleadservices.com
127.0.0.1 apps5.oingo.com
127.0.0.1 oingo.com
127.0.0.1 www.oingo.com
127.0.0.1 service.urchin.com #[Urchin Tracking Module]
127.0.0.1 ads.chitika.net #[IE-SpyAd]
127.0.0.1 ads1.chitika.net
127.0.0.1 blogads.chitika.net
127.0.0.1 ca.chitika.net
127.0.0.1 mm.chitika.net
127.0.0.1 scripts.chitika.net
after you add this stuff and then save it.....