How do I install my printer Canon MP250 onto my Macbook Air?

I am trying to download a printer driver to connect my mac air with my printer canon MP250 series. Does anybody know how or where can I download and install one? I downloaded the driver from the Canon website but I don't think I dowloaded the right one. I've tried to go to Printers and scanners in system preferences then click the + button to add the printer. Then it finds my printer and I click on it, but the screen says "Software for this printer isn't available from Apple. Contact the printers manufacturer for the latest software". Then I go to this website: http://usa.canon.com/cusa/windows_7/multifunction_printers/inkjet/pixma_mp250?se lectedName=DriversAndSoftware and I have no idea what to download. Can anyone help??