RandyH =IF(LEN(B29)>0,J29*D29/100,"") Is not accepted in Excel for Office 2000!
Does it give you a particular error message? I did a quick google of looking for a blank cell in Excel 2000 and the test you cite is supposed to be good for versions from 97 through 07 at least.
The one page I looked at mentioned a function called ISBLANK. So if you set that one up:
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