Grouping and getting faster

[MakeLei]

Hi,
Could some one please help me with my code. I have NOT done programming
before and more than likely these are simple for others here....

This code is working, but
1) It should be made shorter and clearer ( I suppose it makes thing
several times in vain). Now it checks tha in row 7 when there is number 7 the
cells from 8:500 down will be grey and when there is 12 right border will be
thick. Also in case there is text in column A row will be grey and in case
there is a text in column E the row will be purple.

2) I would like to add code that detects if there is text added to column A
(A8:A500) and updates grouping from text to last empty cell, starting next
group from the following cell continuing to last empty cell. This should be
run each time there is a change in column A.

Thanks in advance...
Make

Private Sub Worksheet_Change(ByVal Target As Range)

Dim rng As Range, rng2 As Range
Dim rng3 As Range
Dim rCell As Range
Dim i As Long
Dim arr As Variant
Dim k As Long
Dim kolA As Double


Const Month7 As String = "7"
Const Month12 As String = "12"

Set rng = Me.Range("A7:CD7")
Set rng3 = Me.Range("A8:CD500")


If Not Intersect(Target, rng3) Is Nothing Then
For Each rCell In rng.Cells
If UCase(rCell.Value) = Month7 Then
rCell(2).Resize(500).Interior.ColorIndex = 15

Else
If UCase(rCell.Value) = Month12 Then
Set Area = (rCell(2).Resize(500))
With Area
.Borders(xlEdgeRight).Weight = xlThick
End With

rCell(2).Resize(500).Interior.ColorIndex = xlNone

Else

kolA = Cells(Rows.Count, "A").End(xlUp).Row
For k = 8 To kolA
If Range("A" & k) <> "" Then
Range("A" & k & ":CD" & k).Interior.ColorIndex = 15


End If
Next k

kolA = Cells(Rows.Count, "E").End(xlUp).Row
For k = 8 To kolA
If Range("E" & k) <> "" Then
Range("A" & k & ":CD" & k).Interior.ColorIndex = 39

End If
Next k

rCell(2).Resize(500).Interior.ColorIndex = xlNone
Set Area = (rCell(2).Resize(500))
With Area
..Borders(xlEdgeRight).LineStyle = xlNone
End With

End If
End If

Next
End If

End Sub