mounting and unmouting CD-ROM automatically

[Adagilson Batista Bispo da Silva <adagilson cpqam fiocruz br>]

Everytime I dedice to seek inside the contents of CD-ROM I have to 
unmout the disc into the tray eject and mount another one. I use Gnome 
1.4 but I know that KDE mount the CD-ROM just with only one click on the 
desktop icon.
1.How could I mounting my CD-ROMs just with a double-click or one click 
over my desktop icon?
2.I wonder if I can exchange my discs without unmounting (manually) one 
and mounting the new manually too. In windows when you eject the system 
knows that you don't have no CD-ROMs inside the tray.
3.At least, could I put an icon over my desktop that should mounting (if 
nothing is unmounted) and unmounting (if something is mounted) with a 
double click?
I just want to automate these processes.
Thanks for any help!
a.