Just background picture

[philmz]

While logging in,I clicked on "Gnome" instead of "Gnome Classic" and now all I get is my desktop with background picture.There are no icons,etc.How can I get back to the log in screen to get "Gnome Classic." I am using Ubuntu 12.04 Gnome Classic not Unity.Everything was working perfect until this mistake! I can get to the terminal but I don't know what to enter!
Thanks for any help!!
Phil

[neu2buntu]

try key combination Alt+PrtSc+k this should log you out ;)

[philmz]

try key combination Alt+PrtSc+k this should log you out ;)

It worked-thanks a million!
phil