Windows 7: change order of taskbar thumbnail previews?

i always keep 2 firefox windows open when i'm working, one for work and one for, uh, non-work stuff. i always open my non-work window first, so its preview thumbnail is on the left, while the other window's preview thumb is on the right.

lately, they've been swapping for some reason. i'll go to open a particular window using the taskbar, and it will be on the wrong side.

is there any way to switch these short of shutting down the first window and opening it again?

i know it's pedantic, but i'm compulsive about this sort of thing, and it's really bugging me

Open them in order?

=D

yeah, thanks for that. most helpful.

I wish someone would have answered this seriously. I hate this too. I'm with ya garbanzo!