Make UI thumbnails in the browser an imagecache preset

I use slightly larger thumbnails on my site (as set via the image module preferences) of 125x125 instead of the default 100x100. This breaks the ImageBrowser UI slightly as it expects thumbnails to be 100x100. It is still usable, but ugly.

My solution was to add width and height in the html to scale them to 100x100. Changing the css did not work for me, as I did not find the place where the size of the popup window is specified.