One way

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
Const WS_RANGE As String = "H1:H10"

On Error GoTo ws_exit:
Application.EnableEvents = False
If Not Intersect(Target, Me.Range(WS_RANGE)) Is Nothing Then
With Target
If .Value = "a" Then
.Value = ""
Else
.Value = "a"
End If
.Font.Name = "Marlett"
End With
End If

ws_exit:
Application.EnableEvents = True
End Sub

'This is worksheet event code, which means that it needs to be
'placed in the appropriate worksheet code module, not a standard
'code module. To do this, right-click on the sheet tab, select
'the View Code option from the menu, and paste the code in.


--

HTH

RP
(remove nothere from the email address if mailing direct)


"Rick" wrote in message
...
how can I make an excel cell "mark" or "unmark" when clicked on?