AJAX Dropdown for language selection

I have a website that is developed using wordpress. I need the header to be tweaked in order to include a drop down on the right hand side section. The drop down needs to be Ajax powered as can be demonstrated on this website: [login to view URL] There are a total of 3 selections: English, Russian, Latvian. The drop down will have in total 2 selections. Example: When someone visits the english version of the site, then the drop down should show just RU and LV. When someone visits the russian version of the site, then the drop down should show just EN and LV. When someone visits the latvian version of the site, then the drop down should show just EN and RU. When english is selected, the site should be directed to [login to view URL] When Russian is selected, the site should be directed to [login to view URL] When Latvian is selected, the site should be directed to [login to view URL] Refer to the attached screenshots on how the design should be. I use subdomains, and each language site is coded individually. This means that I need 3 different codes. There is a search box on the top right side. That needs to be converted to AJAX drop down. The 'GO' must be replaced by an arrow indicating language selection. When a visitor is on a particular page, and the language selection changes, they should be taken exactly to that page in the language they choose. All URL's remain the same, except the first part. Meaning it can change between [login to view URL] to [login to view URL] hope this makes sense.