SQL select help

[liz82much]

I need to select the most recent record within a date range for each combination of two ids. In other words, given the folowing table:

ID1 ID2 MyDate MyNum
1005 27 9/12/06 13:00 100
1001 21 9/12/06 13:00 500
1005 27 9/12/06 12:00 300
1004 21 9/12/06 12:00 200
1001 11 9/12/06 12:00 1000
1001 27 9/12/06 12:00 2000
1001 21 9/12/06 12:00 3000
1005 27 8/19/06 13:00 100

I need the records for the most recent MyDate in the 8hours ending with 9/12/06 13:00 for each ID1 and ID2 pair. Going back to the table, here are what the results should be:

ID1 ID2 MyDate MyNum
1005 27 9/12/06 13:00 100 I Need
1001 21 9/12/06 13:00 500 I Need
1005 27 9/12/06 12:00 300 NO - there's a more recent record
1004 21 9/12/06 12:00 200 I Need
1001 11 9/12/06 12:00 1000 I Need
1001 27 9/12/06 12:00 2000 I Need
1001 21 9/12/06 12:00 3000 NO - there's a more recent record
1005 27 8/19/06 13:00 100 NO - not in the date range

The following select statement gets me the most 13:00 submissions but not the others.
SELECT ID1, ID2, MyDate, MyNum
FROM T
WHERE (MyDate = (
SELECT MAX(MyDate) FROM T WHERE
MyDate >= TO_DATE('09/12/2006 05:00','MM-DD-YYYY HH24:MI') AND
MyDate <= TO_DATE('09/12/2006 13:00','MM-DD-YYYY HH24:MI')))

Any suggestions? Thank you.