Greybox doesn't stay put when scrolling the page

I recently implemented Greybox Redux on a soon-to-launch site. Using it for a screenshot page, I scrolled down about half-way and clicked an image. No greybox... Rather, it was at the top of my page requiring me to scroll up.

Some Google searching later I found a solution at http://jquery.com/blog/2006/02/10/greybox-redux/. Credit goes to Tom Zellman (http://www.feednut.com/). He replaces the GB_position function and adds another Javascript function call after $(window).resize(GB_position);.

I have attached greybox.js (v1.2) from the Greybox Redux module which includes Tom's new code. As far as I can tell it works fine under Drupal 5.1.