Kane

Only through VBA.

Sub ProtectAllSheets()
   Application.ScreenUpdating = False
   Dim n As Single
   For n = 1 To Sheets.Count
       Sheets(n).Protect Password:="justme"
   Next n
   Application.ScreenUpdating = True
End Sub

Sub UnprotectAllSheets()
   Application.ScreenUpdating = False
   Dim n As Single
   For n = 1 To Sheets.Count
       Sheets(n).Unprotect Password:="justme"
   Next n
   Application.ScreenUpdating = True
End Sub

If not familiar with VBA and macros, see David McRitchie's site for more on
"getting started".

http://www.mvps.org/dmcritchie/excel/getstarted.htm

In the meantime..........

First...create a backup copy of your original workbook.

To create a General Module, hit ALT + F11 to open the Visual Basic Editor.

Hit CRTL + R to open Project Explorer.

Find your workbook/project and select it.

Right-click and Insert>Module.  Paste the code in there.  Save the
workbook and hit ALT + Q to return to your workbook.

Run the macro by going to Tool>Macro>Macros.

Gord Dibben Excel MVP