Check the power supply on the laptop, it's probably all set for 220 and 50 cycles, most are.
If it is, all you need is an adapter, you can get that anyplace travel supplies are sold, at Radio Shack, etc. You may as well get the set of adapters, five or six interconnecting things that cover just about every plug on the planet. Usually $10 for the set depending on where you get them.
If the laptop doesn't have 220 capabilities already, then you either need a voltage converter or a power supply for it that covers that volatge, which ever is less expensive (probably the converter).