Profile: dpsherratt

Hi, I am in South Africa and our currency is "R" (rand). Our entire site displays this correctly, except for the "Just added to your cart" popup which displays it as a "r" e.g:
r 7 200,00 incl vat / per unit

Any idea how to change this? I don't mind digging in the code but please give me a clue as to where and what!