Q: How can I put a language switcher and currency switcher on top of my site?
You can check how the language switcher is displayed at the top in the phtml file app\design\frontend\default\lightshop_green\template\page\html\header.phtml
In the app\design\frontend\base\default\layout\page.xml file, there is an XML instruction
It tells Magento to display the language switcher in the header.
Similarly, there is a XML instruction for currency. It looks like this: