OpenGL animation preview

I saw a post where it was said that it was possible to have a OpenGL animation preview. They told to go to the render menu, and click “Opengl preview animation”, but i don’t find anything like that…
So i don’t understand.
Thx

ps : i’m running blender 2.32

Okay i finally find it…just have to ctrl-click the picture icon (the rightest) in the 3d view’s header.

Thx anyway.