What keys did I accidentally press? My title bar and menu bar at the top of the screen is hidden?

I am familiar with how to hide the task bar at the bottom of the screen ,and how it is that holding the cursor near it, makes it pop up for a moment, as most people are. But something like that has happened to my title bar and menu bar at the top of the screen. When I am on the internet using internet explorer those things are hidden. How do I undo it?

tbshmkr2009-06-11T16:05:45Z

Favorite Answer

F11
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?2009-06-11T16:05:46Z

f11 try that it might work