Scripts not showing on Safari

Hello,
I have inserted in the sidebar and in some posts a script.
See this page for example: http://allonsvoirailleurs.be/carnets-de-route-2/
At the bottom of the sidebar, there is normally 2 scripts working under “Réservez vos prochaines vacances”, one for booking.com and one for momondo.fr
The thing is that on Chrome it works nice but on Safari they are not displayed. Same issue on Firefox.
What can I do?
Thx,
Pierre