i have a table with dates running down one column and i find it hard to keep track of which week or row i am in, as there is a lot of data to look at. i would like to be able to put the start date of a given week into a cell, and for that row to throw up a thick black border. the dates in the column relate to the start date of that week.

eg:


date = 21/01/08


07/01/08
14/01/08
===============================
21/01/08
===============================
28/01/08
04/02/08


and then of course to undo the border when the date is changed.


i'd appreciate any help, cheers