Help with an "IF" scenerio in Excel XP

[Kasturi]

I am trying to write an "IF" scenerio.


I want to be able to control what is put in a cell based what is placed in another cell.

For example.

I want to be able to only enter a credit/debit in B1 based by what I type in A1.

If any cell in column A is any of these numbers (41,47,48,49,50,51,52,60,61,65,68,63,67,69) then any number entered in a cell in column B can only be a positive number. If any cell in column A is any of these numbers (40,42,43,44,45,46,52,53,55,56,57,64,62,66) then any number entered in a cell in column B must be a negative number.

So if A1 is 41 then B1 must be positive (debit).

If A4 is 42 then B4 must be negative (credit).

Any help would be appreciated.


Kas