Keyboard problems

Okay, so I would like to only be using the Left Alt-key for Third level symbols, but when I enable “Any Alt-key chooses third level” it transforms into an Alt Gr-key, which disables shortcuts like “Alt+Tab” and “Alt+F2”, and that’s annoying. And I can only switch back for the current session, it goes back to “Any Alt-key chooses third level” when I log out.
How can I make the Left Alt-key to work wit both shortcuts and third level symbols?
Help?

//xeeki

Because you cannot have two different symbols attached to the same key combination; you have to have one or the other. If you want both available, leave the third level symbols on Alt-Gr.