DMG Automounter is a nautilus script that enables any distribution of Linux to mount a Mac OS X .dmg file (but not install it, since that would require the Mac OS X APIs which are closed source). README has entire install instructions. PLEASE DONATE!
Copying both shell scripts to ~/.gnome2/nautilus-scripts
Copying the folder, dmg2img, to my home folder
Dmg file successfully mounted!
Making the shell scripts, dmgmount & dmgunmount, executable
Prior to mounting the file, Hazel-2.2.dmg
RightClick, Scripts,When Prompted to Open Volume, click OK