Like Cloud Zoom?

Yeah, it's similar to that. I started this because of some issues I ran into with the cloudzoom javascript, particularly with centering an image, and changing the size of the zoom window. It was becoming a tangled mess of CSS and javascript, so I pulled out my calculator, and figured out the math to write my own simple script.

have the same problem with centering image (when using cloud zoom)
I also tried http://drupal.org/project/imagelens but does not help

can you help with css setting to center image into its container ?
can I see it somewhere working ?

to answered my own question above if the image is part of a field called images then you need

.field-name-field-images .field-item {
  text-align: center;
}

to center image on its container

BTW great improvement on the cloud zoom module. Thanks