I'm not sure whether it will automatically offer it but I would expect it to as widescreen resolutions are now quite common on laptops.
If not, you should be able to choose a custom resolution with the Nvidia software (display properties, settings, advanced). I use a 6600GT so I can't be sure exactly how yours will work but from there I click the 6600GT tab, then choose screen resolutions and refresh rates. In here I can choose custom resolutions. click here