Hello folks

Hope someone can help with this little query, I've created a calendar in Excel and I want to be able to double click on a cell to change the colour. If the cell is white I want it to turn to green, if the cell is green I want it to turn back to white. Furthermore if the cell is grey I don't want it to do anything. The cells in question contain the actual dates, and the purpose of this functionality is basically to allow the user to double click on the dates that they have booked off for vacation.

Can anyone help please?

Thanks to you all
Kenny