Automatically Check For Existence Of Hidden Sheet Upon Open

I use the code below to check and see if a sheet exists or not when a workbook is opened. If it does not, continue. If it does I need to run a different sub on it.
Twist, I need to check for a hidden sheet. How would I chg the code to do this?

Private Sub Workbook_Open()
'Also need to check the code in the userform. Has On.Time command.
'SplashForm.Show
Sub Sheet_Test_1()
Dim sh As Worksheet
On Error Resume Next
Set sh = ActiveWorkbook.Sheets(" total")
If Err.Number <> 0 Then
MsgBox "The sheet doesn't exist"
Err.Clear
On Error Goto 0
Else
MsgBox "The sheet exist"
End If
End Sub