Colour Calibration - : Spyder 3 Pro - Can you turn on/off different profiles?

[punchretouching]

Q: Can you turn off Spyder 3? Can you switch between original (uncallibrated) and new (callibrated and oh so yellow?)

To explain a bit:

Hi all, I've just calibrated my laptop with a Spyder 3 Pro - it appears to have made everything noticably yellower (even the next day with fresh eyes it still is very warm)

This is fine, as its how one of my clients has their screen. When I'm working on their photos this profile will work great, but all the other photos look wrong and to make them look normal on my screen would be to make them VERY cool on a normal un-callibrated monitor.
Thankyou in advance for any suggestions.
Guy