Render F12 Black?

Hello.
I do not really know what happen. When I press F12 the renderwindow turn black.

Can you take a look at my blendfile and give me some advice
Thanks in advance http://www.pasteall.org/blend/7656
Karl

in your outliner you you set your mesh to be invisible when rendering. press that little camera button and it will come back.

Hi JO5EF. Sorry I dont understand what you try to tell me. I press everything at this outline window. Can you explane little bit more.
Thanks http://i1023.photobucket.com/albums/af353/Spender19/Skrmavbild2011-07-17kl223538.png
Karl

I find the button. Everything is back as normal.
Thanks
Karl