Client side filter for browsers

I get increasingly frustrated by long download times for certain pages due to the use of banner advertising.

I would like to develop a filter so that requests from my browser for banner adds results in a local file access rather than a URL access. I would like suggestions for how this could be achieved.

The only idea I have at the moment is to look for requests for URLs which are gifs of a certain size typical of banner adverts but the URL requests to WinSock do not contain this information.

The second idea is to monitor incoming data in some way and look for the html which characterises banner adds then store the URL so that outgoing requests will then be intercepted.

Any other ideas? Perhaps this could be developed into a commercial product, I expect many people would like to be able to ignore this type of advertising.

(Sorry if this annoys experts-exchange who are starting there own banner adverts!).
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icdAsked:
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dmethvinCommented:
You can use a proxy server to filter out just about anything you like. Run the proxy server on your client machine and point the browser to it.

Randal Schwartz did a column in the February WebTechniques about writing an anonymizing proxy server in Perl, you could easily adapt that to filter out content in the page itself.  The Perl script and column is at
http://w3.stonehenge.com/merlyn/WebTechniques/col11.html

As you mention, the criteria for determining ads is a bit heuristic. Good bets are any image URLs with the following words: ad, ads, advert, advertisement, doubleclick, focalink.


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icdAuthor Commented:
That looks pretty good but as far as I can tell it will only work on a UNIX system. Correct me if I am wrong.

I would really like an approach that could be run on my own PC. I will have to see if the technique will work with Win32Perl:Internet
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icdAuthor Commented:
Sorry for the delay in grading.
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