This would be easier to do with inline ARexx.
Here's an example:
http://carls.1av10.nu/w3s/example/html_layout.txt - this would be the HTML file that executes the inline ARexx.
getnews.rx - this is the script that reads the news
newslist.txt - the news (one news item per line)
This is just a very simple example, but at least it's a start! If you are new at ARexx I would also recommend you to download ARexxGuide from Aminet, it's a great AmigaGuide with both tutorials, examples and a language reference!
Happy hacking :-)