Space in the Oracle Query

Hi
Can some one help me with this request
I have a Table which has stored date and time as varchar in the format give below
20061026 081535
20061026 091035
20061026 081535
20061026 091035
I would like to know how to capture records created 2 hrs back.. Lets says sydate and time is 20061026 040001 i need records created between 20061026 02 to 20061026 04 inclusive of the time specified
Also there is a space between the Date and the Time , since that is how it is stored in the database..
Awaiting your help..
thanks
Ur Friend

sql>SELECT * FROM T;
DT DT1
27-OCT-06 08.15.35.000000 AM 20061027 081535
27-OCT-06 09.10.35.000000 AM 20061027 091035
27-OCT-06 08.15.35.000000 AM 20061027 081535
27-OCT-06 09.10.35.000000 AM 20061027 091035
sql>
SELECT t.dt,t.dt1,current_timestamp
FROM T
WHERE TO_TIMESTAMP(DT1,'YYYYMMDD HHMISS') BETWEEN
    TO_TIMESTAMP(TO_CHAR(CURRENT_TIMESTAMP-(6/24),'DDMMYYYY HH24MISS'),'DDMMYYYY HH24MISS')
    AND CURRENT_TIMESTAMP
DT DT1 CURRENT_TIMESTAMP
27-OCT-06 09.10.35.000000 AM 20061027 091035 27-OCT-06 02.51.55.625000 PM +05:30
27-OCT-06 09.10.35.000000 AM 20061027 091035 27-OCT-06 02.51.55.625000 PM +05:30

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