Dear All, from a script of mine, I would like to call up 2 images next to each other. I have figured out that I can use spm_check_registration for that, but I have not found out how to catch the callback if I click on the images. I would like to retrieve the voxel position in the image to work with values from another volume (of the same dimensions), and I just can't seem to figure out how to get this to work. If anyone has gotten something like this to work, I would appreciate your input. Thanks in advance, Marko -- ===================================================================== Marko Wilke (Dr.med./M.D.) [log in to unmask] Universitäts-Kinderklinik University Children's Hospital Abt. III (Neuropädiatrie) Dept. III (Pediatric neurology) Hoppe-Seyler-Str. 1, D - 72076 Tübingen Tel.: (+49) 07071 29-83416 Fax: (+49) 07071 29-5473 =====================================================================