How to auto hyperlink http strings?

Hi,

I need to autolink any text added to the news box that starts with http.

Ie: If I write http://www.google.com, cutenews should automatically create the link http://www.google.com

I've found some php codes, but failed to include them in cutenews 1.5
http://www.couchcode.com/php/auto-link-function/
http://www.gidforums.com/t-1816.html