Sub TblHiLite()
Application.ScreenUpdating = False
Dim Hdr As Long, S As Long, W As Long, C As Long, R As Long, H As Long
Dim StrTitle As String, StrParms As String, StrRGB As String
'Abort if the cursor is not in a table
If Selection.Information(wdWithInTable) = False Then
  MsgBox "The selection is not in a table!", vbOKOnly, "TblHiLite"
  GoTo ErrExit
End If
'Get Parameters
On Error GoTo ErrExit
StrParms = Split(Selection.Tables(1).Range.Previous.Paragraphs.Last.Range.Text, vbCr)(0)
C = Trim(Split(Split(StrParms, "=")(1), ",")(0))
Hdr = Trim(Split(Split(StrParms, "=")(2), ",")(0))
StrRGB = Trim(Split(StrParms, "=")(3))
S = RGB(Split(StrRGB, ",")(0), Split(StrRGB, ",")(1), Split(StrRGB, ",")(2))
On Error GoTo 0
W = RGB(255, 255, 255)
'process the table
With Selection.Tables(1)
  If C > .Columns.Count Then
    MsgBox "There is no column " & C & " in the table!", vbOKOnly, "TblHiLite"
    End
  End If
  If Hdr > .Rows.Count Then
    MsgBox "There is no row " & Hdr & " in the table!", vbOKOnly, "TblHiLite"
    End
  End If
  StrTitle = Split(.Cell(1 + Hdr, C).Range.Text, vbCr)(0)
  .Rows(1 + Hdr).Shading.BackgroundPatternColor = W: H = W
  For R = 2 + Hdr To .Rows.Count
    If Split(.Cell(R, C).Range.Text, vbCr)(0) <> StrTitle Then
      If H = W Then H = S Else H = W
      StrTitle = Split(.Cell(R, C).Range.Text, vbCr)(0)
    End If
    .Rows(R).Shading.BackgroundPatternColor = H
  Next
End With
Application.ScreenUpdating = True
End
ErrExit:
MsgBox "Invalid Parameter", vbExclamation
End Sub

Sub Demo()
If Selection.Tables(1).Range.Start = ActiveDocument.Range.Start Then
 ' code for table at top of document
End If
End Sub