I've got a workbook with several different sheets. I want a macro
that will select the required sheet depending on what cell is
highlighted.

For example there are cells for Jan, through to Dec. If the Mar cell
is highlighted, when the user clicks on the macro button I want it to
open the sheet for Mar and do some processing. I know how to do the
processing but how do you change what sheet is active based on this
kind of user action?

Thanks!