Hi Lakshmi -
Try this:
Sub test()
Dim l_Col As Integer
Dim n As Integer
'Change the below sheet name and row number accordingly
l_Col = Sheets("Sheet1").Cells(2, Columns.Count).End(xlToLeft).Column
For n = 1 To l_Col
If UCase(Trim(Cells(2, n).Value)) = "WEEK 4 JANUARY 2013" Then
Cells(2, n).EntireColumn.Insert
n = n + 1
End If
Next n
End Sub