how to close Fancybox from a link inside it

[cubalibre1]

clicking on a link to a page where I open the popup Fancybox, automatically opening, I include a list of articles with Ajax (code, description). Each item code is linkable.
When I choose an item number by clicking on one of them, clicked up the code in a field of the calling page below (and this I can do it) but I also want that after the choice, at the same time, the popup Fancybox were closing by itself.
If I use $. Fancybox.close () returns the error Firebug I $. Fancybox is undefined.
How can I fix?

[devnull69]

Javascript is case sensitive. Did you try $.fancybox.close()?

[cubalibre1]

Tried...... $.fancybox.close()...... same.....