Q:

Is there a jquery scrollbar plugin that can sync several instances?

The value of the scrollbar should be 0~100%.
And the value of all scrollbar instances should always be the same.
Is there such a plugin?

A:

This jQuery plugin seems to do what you want, though I don't know if it's compatible with the latest version of jQuery.
See also:

How to synchronize scrolling positions for several iframes
Synchronizing Scrollbars using JQuery

