You should of course check the fine print on your own laptop power adapter to be certain, but I have never seen one that was US-specific. They typically accept anything from 100-240 V and 50-60 Hz. The only issue is a plug converter to physically connect it. You are likely to encounter a variety of outlet types in Europe, but the "Schuko" plug is emerging as the most common. Here is a US-to-Schuko plug converter, just as an example:
http://about.pricegrabber.com/search...asterid=273781
(Just to be very clear: this is NOT a transformer. It does not change the voltage, only the mechanical connection.)