excel 2000 conditional formatting

Could someone help me please. I have a spreadsheet created in excel 2000. I have a number of rows and columns. The columns (52 in all) are weeks of the year and the rows are for tasks to be achieved in certain weeks.What i want to do is twofold. Firstly i want a cell to fill with a colour (i.e. red) if for example "nd" is typed in it and secondly if more than one cell is thus coloured on a row , for that entire row to "flash" on and off or otherwise indicate that this has happened.