Change tab color based on current color of a cell

[MarkT]

Greetings all!

I have a spreadsheet created in Excel 2007 that I am looking to have the tab
of each sheet the same color as a specific cell within that sheet. The cell
(M20) is a results cell that contains a formula and has conditional
formatting which will shade the cell green if positive or red if negative. I
would like each tab for each sheet to either be green or red depending on the
color of cell M20.

Is this possible?

Thanks in advance.

Mark