How can I disable [alt] for search? [duplicate]

Possible Duplicate:
How do I modify or disable the HUD's use of the Alt key?

In 12.04, the [Alt] key pops up the HUD. That's not a problem, but, when using [Alt]+... it pops up as well.

For instance on pushing [Alt]+[Left Arrow] which I use continually when navigating with Firefox (that's the 'back' functionality).

Is there a way to prevent this from happening?

You can easily change the hotkey for the HUD by going to System Settings --> Keyboard --> Short-cuts as in the following picture :

Note that: Clicking ALT fast , shows the HUD. But When you click and hold you can use it easily for another function. I use ALT without any problems.