Newbie: current_url() inside anchor()

[eluser]MEM[/eluser]
Hello all,

It's weird that I cannot find anyone who actually have asked this on the forums, so I'm wondering if I'm doing something structurally wrong... Probably.

I'd like to configure some navigation menu links and, let's assume, I cannot change the third segment of the URI, so I need to add a new segment on the URI.

Let's say we have something like this:
http://www.site.com/c_categoria/seccao/1

And once we click on a menu link, we want to get something like this instead:
http://www.site.com/c_categoria/seccao/1/22


1)
What is the right syntax in order to use current_url() inside the anchor()?

Regards,
Márcio