Hi I like Zuki thanks for the great…

Hi, I like Zuki – thanks for the great theme!
Somehow my links in the sidebar always get my domain name in front of the url that I want to link to.
Example: I want to link to http://www.airbnb.com but if I hover the link on the front page it links to http://mydomain.de/www.airbnb.com
Do you have any idea how to fix this?
Thanks ahead for your support!

You can have a look here: http://navinachnirgendwo.de