Red Hat :: Changing Automount Options For Removable Media?

This appears to be a simple problem, but I struggled my way around google, trying to figure out the right words to search for, with no real success. The problem:When I plug-in any usb device or an external hard disk, my RedHat automatically mounts it to /media/<device_name>. Unfortunately, it's owner and group are both root, whereas, I would like to add other users to have write access (say, all users in a group usb_group to be able to write stuff in it). Currently only read access is there for others. I would like to change it to write access to a particular group and I can add the