espaconline, in the future please start your own thread when asking a question. Anyhow, checking out your page, there are a couple of JavaScript errors at the moment you'll want to fix first before anything, as they may interfere with the functioning of other scripts on the page:
Code:
Error: $("#my-list")[0] is undefined
Source File: http://www.caixadaweb.com/pitagoras/contactos.php
Line: 73
Error: crossmain is null
Source File: http://www.caixadaweb.com/pitagoras/js/motiongallery2.js
Line: 128
If you're not using motiongallery2.js on your page, I recommend just removing it to fix that error. For the first, you may want to remove the relevant script as well if it's not in use.
Bookmarks