Thank you Rosa, meanwhile I have received an answer from my CMS. I thought I had erased my request here on Beds24 but apparently it didn't. Thank you for your answer though.

Hi ! Code generated by Beds24 to embed the booking page into my website is the following one : <!-- bookingWidget requires jQuery and jQueryUI --> <!-- Include the following line ONCE ONLY on the page, preferably in the document head --> <script src='https://media.xmlcal.com/widget/1.00/js/bookWidge...