Block internet access to browsers?

[D@rekills4]

How can I block internet access to the browsers?
I have FireFox and Internet Explorer running on Windows 7.....

I tried blocking through Firewall but still both are able to access the web....

 

[asingh]

Use proxy settings, and put some fudged details in there.

 

[D@rekills4]

Use proxy settings, and put some fudged details in there.

How to do that?
I have no idea....

*chzscience.files.wordpress.com/2011/11/funny-science-news-experiments-memes-dog-science-fuzzy-logic.jpg

 

[asingh]

^^
For FF:

tools, options, advanced, settings [under connection], choose manual proxy and just put in random stuff.