One Logo for each language

Hello,

I am creating a website with 2 languages (English, Arabic), that means ltf and rtl directions. While I can change the menu for each language, I cannot change the logo… How can I change the logo and its position ( from left to right ) ? I want to change from the English logo to the Arabic logo. Thank you for your help.
Please, it is urgent!!

The page I need help with: [log in to see the link]