Multiple URLs in profile ("Add another URL")

Hi,

maybe I'm missing the forest through the trees but: how do I allow for dynamic multiple URL fields in the user profile? It should look like this:

URL ________________________
[Add another URL]

And if you click on Add another URL then it would be:

URL _http://www.drupal.org____
URL ________________________
[Add another URL]

Any module that can do this?

Thanks!
Benedikt