-unable to show desktop icons in Linux

hi

i was use RHEL 4.i was mount cd in cdrom device in Gnome ,but i saw a message box contains some errror messsge,but after i remove the cd my gnome desktop icons(home,My computer ..)are disappeared.there are no icons show in my desktop and no right click in mouse in desktop.

but task panel is working,i was select menus in start menu it was working.

tell me how to recover my desktop icons in my system,

kindly send details immediately,becuase i was wait this mail.

thanks & regards,
S.Amanulla