Everyone is trying to tell you how to rock the chair, but no one is telling you how to do it with one dial...

What version of Poser are you using? Poser 9 and 2012 both have dependent parameters, which you can use to set up the chair to rock by "teaching" a master dial to both pivot and translate to simulate the rock of the chair. If you are using an older version, I am not sure how that is done.

If I had a nickle for ever time a woman told me to get lost, I could buy Manhattan.