[R] merging two datasets

[n.vialma at libero.it]

I have some probems in merging the following datasets:

table1

Paese                     Continente

Italia                           EU
francia                        EU  
germania                  EU
stati uniti                     AM
canada                        AM



table2

Continente                      valuta

EU                                     euro
AM                                    dollaro


the results should be

Paese                                Valuta

Italia                                      euro
francia                                   euro
germania                                euro
stati uniti                                dollaro
canada                                   dollaro


there is anyone who can help me??
THANKS A LOT