You could always use a macro and assign it to a new button on a toolbar:

Sub ChangeSigns()
Dim cell As Range
Application.ScreenUpdating = False
On Error GoTo NoRangeFound
For Each cell In Selection.SpecialCells(xlCellTypeConstants, 1)
cell.Value = cell.Value * -1
Next
Application.ScreenUpdating = True
Exit Sub
NoRangeFound:
MsgBox "No values found!"
Application.ScreenUpdating = True
End Sub

---
This will only change numerical constants, not formulas returning numerical
values.

HTH
Jason
Atlanta, GA

"epowell74" wrote:

I'd like to see a function or a toolbar button that would allow you to
reverse the sign of numbers in a selection.

Thanks!

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