Use sheetname to open a Userform

Hi

I want to Show a different Userform based on the sheet its opened from. I have tried code below but the UserForm name is in the wrong format but can’t find the correct Dim, can anyone help please? The target Userform is ‘cables_form’.

Snippet:-

Tried both of these:-

Dim form_name As String
Dim form_name As UserForm

   sheet_name = ActiveSheet.name
   form_name = sheet_name & "_form"
   form_name.Show

I am using Excel 2000

Andrew