Semi Urgent Problem and i bet it's simple

Hi

Ok this is bound to be easy

Somehow i have managed to lock and hide my datasheet (or something like that).
I went to hide the information in a worksheet so that nobody could play with the figures. However somehow i have done something else. The whole sheet is greyed out and the row/column tabs are black. I can't click anywhere on the sheet at all - it's like it has been locked and hidden. Yet the normal methods to unlock/unhide it don't seem to work

Any help would be great

cheers
D