Reverse "Parent" and "Children"

dudeness

Hi everyone :)

I'm wondering if it is possible to reverse the IK chain releation of parent and children?

In particular, for a snake figure, originally the parent is the tail. But I'd like to make the head the parent instead (such that when I use active pose to drag it's tail for animation, the whole body wont be moving).

This is a rather rare "problem" lol.. if anyone has some idea i'd be very happy to hear! Thanks in advance! :)