[SOLVED] find last row of data add1 then change row bg colour?

hi all

what i have is a workbook, with worksheets named january to december
i would like either a button for manual input, or when the month ends, to be able to goto the last row of data, add 1 (goto the next row)
and change the background colour to say red for example, to symbolise no more data can be added.
perhaps the button could even toggle the effect on and off? :rolleyes:

i know this is easy to just do manually, but would be nice to just have a button on each page be able to do this!

thanks in advance