Domain name forwarding from .ca + .com to .org name

Hello,

I have a question about redirecting domain names.
To protect my web ID I have purchased .com and .ca versions of my .org name. However, currently when a user types in the .com or .ca version they get the same content as the .org version, which is good . The bad thing is that in the address bar the name stays as typed, i.e. .com, .ca, or .org. For consistency I want the address bar to display the .org version so when a user types in the .com or .ca version, the address switches to the .org version. A working example of this is on the http://www.robertbike.org/ site. When I type www.robertbike.com the address automatically changes to www.robertbike.org. I was able to mimic this when my .com and .ca versions were not parked on my host. But I need them to be parked on the host so that I can enable email forwarding in case a user sends an email to one of the .com or .ca versions or our old web address.

The redirect feature in cPanel only works for pointing from a file name to a new domain name... and an HTML-side redirect just loops the redirect into infinity.

I would really appreciate your help on this.

Sincerely,