How Do YOU Like Full Sized Images To Open?

I have a question for everyone. When viewing images in a gallery do you prefer to have the full sized image open in the same browser window (which it is currently set at at Utch's Web Page), or do you prefer to have the full sized image open in a new browser window? As it is now you close the full sized image by hitting back on your browser then returning you back to that gallery's page. The other way you would simply close the new browser window.

Thanks for any comments on this, as it is something that I am always personally debating with how I want images opened on my website.
...Utch