I give you a good advice. dont use Mt Gox.
Look here in the Forum, the hold the Money back. But even more worse they started also to delay Bitcoin withdraws !!!
I waited over 30h for a withdraw where the info never warned me about. says 1h max.)
Other people here wait since 3 days!! with amounts from 1k- up to 100000K....
(i had 2.5K)

This is a clear sign that this company has serious problems. Seems insolvent or fraudulent.

So if you dont have Money to burn just for fun. Choose another exchange, try to buy local, or try to find fund methods with built in conversation of cad to usd.

greetings