i've made a set of images using cheese (webcam), it have named it in a way similar to this one:

foo_1.jpg
foo_2.jpg
...
foo_10.jpg
foo_11.jpg
...
foo_20.jpg
foo_21.jpg

Thunar display it correctly from foo_1 to foo_21, ristretto don't.
Ristretto display file in this order:

foo_1.jpg
foo_10.jpg
foo_11.jpg
...
...
foo_2.jpg
foo_20.jpg
foo_21.jpg

so messing it. I've tryied using Eye Of Gnome and it show files correctly.
sorry for my bad english

I'm using Xubuntu 10.10