I am new to magento..as per my design I need to change the currency drop down to a Euro and Dollar Symbols or Images which I had created. So I would like to know how I could go for this? I managed to change the language to Country flags but stuck with this currency issue. Please share a light on this. 

I also wanted to know how to replace "Add to wishlist" and "Add to Compare" and replace it with the images or icons created by me. Please guide me in this regard and also how to bring "email a friend" as an image or icon in the row of "Add to wishlist" ?
![enter image description here](https://i.stack.imgur.com/FgixJ.png)
![enter image description here](https://i.stack.imgur.com/GoIQy.png)
Thanks

Kris