application/pdf; acroread %s image/jpeg; xv %s image/gif; xv %s & image/GIF; xv %s & image/JPG; xv %s & image/jpg; xv %s &
Above, I'm using the program `xv' to deal with graphics, because it's super fast relative to the KDE and Gnome equivalents and SUSE provides it. But it's not included on a lot of distributions (including anything based on Debian) because of licensing concerns, so you can substitute kview, gwenview, eog (Eye of Gnome), or something else for xv.