Jquery slider plugin that supports "Multiple Ranged Handles"

Question

I have been looking for a Jquery UI slider pluging that supports mutiple ranged handles. The existing Jquery UI slider only supports one range set of values. I am looking for a slider that you can have muliple ranges. So a range with an inner range or two ranges that don't overlap.

Example:

R = handle

XX = Slider bar

= or - = Range between handles

XXR1------R1XXXR2--R2XXXXXXXXX

XXXR1----R2====R2-----R1XXXXXX

XXXR1--R2===R2----R3===R3--R1XXXX

I don't think there is a slider out there that can do this?? Just wanted to make sure before I go and write one.