I have a VLOOKUP formula (B5) referencing adjacent cell (B4). If the user
chooses to override the value in the default cell (B5) I want the default
cell's fill color to turn red.

e.g.
if user enters "32" into cell B4 (which is an empty cell to begin w/) the
VLOOKUP formula in B5 checks another wrkbook and returns the default... say
".09".

the user chooses to ignore the default ".09" and enter in ".5" I want the
format to automatically change the fill color to red.

Any help greatly appreciated.
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JS