help with a Photoshop task?

I know this isn’t a Photoshop forum per se, but out of the forums I read this one seems to be the most relevant. So maybe someone here can help me out…

I’m reading a tutorial here:
gradientwipes
And down in the part called “The Roadway Pulse Project” it talks about in Photoshop being able to stroke a pen’s path using a paintbrush option that has a fade feature. But I can’t find this "fade" option anywhere in PS CS3.
Anyone have any ideas on how to get/find it?

Basically what I want to be able to do is to make a line (e.g. a pen path) and have it, as it moves from its beginning to its end, fade from black to white. (...Or if anyone knows how to do it in Paint Shop Pro, I also use that program (version X).)

Thanks if anyone can help. (But if no one can, that’s cool, keep on filter forging!)