Adding code to worksheets

[mgs]

I have a large number of similar spreadsheets which have
the following code in the code modules of all worksheets
in the workbook that are not named "Overview":

Private Sub Worksheet_Change(ByVal Target As Excel.Range)
Application.Run "ESCode.xls!WorksheetCode.PanelsChange"
End Sub


I want to add ", Target" to the end of this line, and have
tried the following code:


For Each sh In Worksheets
If sh.name <> "Overview" Then
Set VBCodeMod = ActiveWorkbook.VBProject.VBComponents_
(sh.index).CodeModule
With VBCodeMod
.DeleteLines 2
.InsertLines 2, " Application.Run ""ESCode.xls!
_WorksheetCode.PanelsChange"", Target"
End With
End If
Next


At first, all seemed well, but then I discovered that the
code in the last worksheet had not changed (all others
had). Further, a section of code that is called when
closing the file stopped working at the following line:


If Workbooks(counter).Worksheets(1).name = "Overview" Then


Msgboxing Workbooks(counter).name and Worksheets(1).name,
I found that Workbooks(counter).name correctly gave the
name of the workbook, but Worksheets(1).name gave a run-
time error. As far as I can tell, this section of code is
in no way related to the code above, but it has worked for
years until I made the changes to the worksheet code.


If anyone can shed some light on this...?

Windows 2000, Excel 97.

mgs