Moving background to camera but only at 25%

I want the background to move with the camera but at a reduce positioning, say 25% of the normal movements. Can this be done?
Thanks for an answers, using AE 7

Thanks Dan, although I am getting an error when I place it on the position of the layer I only want to move 25%.
I get the error 'AE warning: Class 'Layer' has no property named 'P' Expression disabled.'
Have I done something wrong?
Cheers

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