How to make cell background color continuous red green based on value?

Hi all,

I have a column in my report that takes on float values, both positive and negative. Currently I'm using iif statements to have the background color of a cell take on either red, green, or yellow, depending on which of 3 intervals the cell's value falls into.

It would be slicker if I could make the background color continuously "fade" between those three "perfect" values, depending on the exact value of the cell.

Can this be done? How?

Thanks for any suggestions,

sff