Thread:Project:Support desk/How to use only small images from commons.wikimedia.org?

Hello. I use InstantCommons that allows wiki to use images from http://commons.wikimedia.org I indicate some images that should be displayed on the page. It works great. But I noticed that this images are uploaded to my server. It is also good, but they are uploaded with all sizes, which is not very well for me, because I have limited size of disc space where I host How can I limit it? How can use only smallest size of the images from commons.wikimadia.org? Thx for help