Your AC adapter is almost certainly built for 110-240 Volts, which means you only have to adapt the prongs to the outlets. You can buy a travel kit here or, once overseas, visit a knickknack shop and buy the appropriate cheap attachment. I got mine for about 2 Euros in Germany.
iGO products are perfect for powering up your electronics while traveling in Europe. There is the iGO tip S5 90 Watt Legacy Igo notebook charger that would be perfect for you. The price is $22.02 cents on PC Connection Exress, but Amazon has the same one for about 1 dollar less than the one at PC Connection Express. Also, Amazon has alot of other converters that you may want to check out. Enjoy your trip!
I have the iGO converter which is great because it has adapters for all countries & you can reuse the same cable. You can also get a universal adapter to use for any electronic (think IPhone chargers, hair dryers etc) at REI, Amazon, Magellen's travel supplies etc.