the little box/brick converts the power in your house to power that your laptop can accept -- as long as the power adaptor reads 110-240V (Which most do, btw) you can just take the plug that goes into the wall off any power adaptor you have at home (it's a universal style) and just plug it into the brick
edit:
you just need this:
these guys should sell it for cheap:
http://vancouver.en.craigslist.ca/rc...269115460.html