MsgBox on Cell Change

Hello, could some one please help me with the following:

In my Excel 2003 worksheet named: DMRS (copy attched with dummy data) I need MsgBox to pop-up when the user enters in any of the following text values:

Criteria:

1. If in column E the value = Hardcopy and in column F the value = Unclassified or Restricted, then a MsgBox "OCR" pops-up.

2. If in column E the value = Hardcopy and in column F the value = Confidential or Secret, then a MsgBox "CDR, OCR and SHT" pops-up.

3. If in column E the value is blank (no value) and in column F the value = Confidential or Secret, then a MsgBox "CDR" pops-up.

The data range of column E is E4:E65000

The data range of column F is E4:E65000

If any one could please help, it would be greatly appreciated.

Kind regards,

Chris