Hi...........
I don't have 97 on my machine right now and don't remember the exact menu
items, but the feature you're looking for is called Conditional
Formatting........
Try this.........click on C30, then do Format > Conditional Formatting,
......in the popup box, leave first window on left to say "Cell Value
Is".....in the middle window, select "greater than", and in the rightmost
window type =$D$30, then click the "Format" button, choose the patterns tab,
and select the green you want and click ok........then OK again, and you're
done.......anytime C30 is greater than D30, C30 will become green...........
Vaya con Dios,
Chuck, CABGx3