Many laptop power supplies will accept either 110 or 220 power at 50/60 hz. Look at your power "brick" and see if it's got 220 VAC listed as a valid input. My Thinkpad brick says (110-220 VAC, 50-60 hz). If this is the case, you'll just need an adaptor plug to convert your two-blade plug to whatever power plug is used in that country. You can usually get those at Radio Shack for a couple of bucks.
- G