SUMBETWEEN

SUMBETWEEN(rgeValues, minValue, maxValue, bInclusive)
Returns the sum of values that are between a range.

REMARKS
* You can use the user defined MAXBETWEEN function to
* You can use the user defined MINBETWEEN function to
* You can use the user defined ISBETWEEN function to
* You can use the add-in COUNTBETWEEN function to

For instructions on how to add this function to a workbook refer to the page under Inserting Functions