Finding and modifying links

Hi all

I am writing an application that fetches a HTML page from a web server. I
want to check each link in that page and, in certain cases, change it to
point somewhere else. Is there a libwww function to do this? I have looked
at the showlinks.c example program, which finds the links nicely, but how
can one convert them within the page?

Thanks,
Gert Koning
University of South Africa