Running Total On Rows Between Groups

I want to write a stored procedure to add all of the flying time on a given airplane for each flight until now and then reset the total when it gets to a new airplane. I want to be able to pull from the table all flying time from a given date for a given airplane.

For example:

AircraftNo Date Flight_Hrs Total
38 3/1/06 1 4.5
38 5/10/06 1.5 3.5
38 7/10/06 2 2

100 8/19/03 4 8.5
100 10/04/04 3 4.5
100 9/17/06 1.5 1.5

I pulled the following code from the internet but I'm getting errors.

select AircraftNo
,Actual_departing_date,Flight_Hours
,sum(Flight_hrs) over partition by AircraftNo
order by Date
rows between current row and unbounded following) total
from (Select Distinct
F.AircraftNo
,F.Date
,C.Flight_Hrs
From GDB_01_4_Test.dbo.Flight_Log F,
GDB_01_4_Test.dbo.Flight_Cycle_Count C
Where F.Doc_No = C.Flight_log_Doc_No

Am I doing something wrong. I'm getting the following syntax errors (Using SQL 2000):

Server: Msg 156, Level 15, State 1, Line 3
Incorrect syntax near the keyword 'over'.
Server: Msg 170, Level 15, State 1, Line 18
Line 18: Incorrect syntax near 'Flight_log_Doc_No'.