> If you use bordercolor to find the part you want, then
> what will happen if the forum has style template options?

This shouldn't be a problem because the Yahoo! Pipes robot that visits the forum website is always served the default template. The robot won't ever choose a different forum style, if you like. Of course, if the owner of the forum being scraped were ever to change the default template in any way, then the scraper may well break, although this doesn't happen very often in practice.