How to hide the headers

Hi,
how can I hide the top and left headers of the SpreadSheet (ABCEF, 12345...)? Furthermore, I want to hide the bottom "Sheets" tab as well. How can I do it?
Thanks in advance,
MS
how can I hide the top and left headers of the SpreadSheet (ABCEF, 12345...)? Furthermore, I want to hide the bottom "Sheets" tab as well. How can I do it?
Thanks in advance,
MS