web page filter question

[qwer993]

Hi
To better utilize space on my laptop screen (using my rss reader), and avoid scrolling a lot, I want to keep only the body text of the page. I want to leave top-ads, side menues etc- out. If the page is say 200k, I am keeping maybe only 20k, only adding some start and end html-tags. I've tried to make a Proxomitron webfilter like

Matching expression:
* <sometag> \1 <sometag> *
Replacement text:
<sometag> \1 <sometag>

but it wont work, maybe because the byte limit is exceeded?

Is Proxomitron the right tool for doing this thing? If yes, how do I do it? If not, does anyone know any suitable tool?

thanks
tom