How to delete Default Constrraint from SQL server 2000

declare @default_name varchar(256)
select @default_name = [name] from sys.default_constraints
where parent_object_id = object_id('CustomerReport')
and col_name(parent_object_id, parent_column_id) = 'rundate'

exec('alter table dbo.CustomerReport drop constraint ' + @default_name)
go

alter table dbo.CustomerReport
add constraint df_CustomerReport_rundate default getutcdate() for rundate
go

see reference:http://www.mssqltips.com/tip.asp?tip=1425