fix bug where viewer does not disable ra / la if viewlist causes us to land on first/last image

templates/viewer.html

@@ -96,6 +96,10 @@
                 objs=res.objs
                 eid_lst=eids.split(",")
                 offset=res.offset
+                if( current == first_eid )
+                    $("#la").prop("disabled", true)
+                if( current == last_eid )
+                    $("#ra").prop("disabled", true)
                 ViewImageOrVideo()
             }
         })