Is There A Script To Delete All Database Constraints?

Hi all, I am trying to delete all of my table constraints and I generated this script:

declare @table_name sysname
declare @alter_table_statement varchar(256)
declare @const_id integer
declare @prt_obj integer
declare @const_name varchar(256)
declare @parent_name varchar(256)
-- definindo o cursor...
declare constraint_id cursor local fast_forward for
select
id
from
sysobjects
where
XTYPE='PK'
OR
XTYPE='F'
order by
parent_obj

declare parent_obj cursor local fast_forward for
SELECT
PARENT_OBJ
FROM
SYSOBJECTS
WHERE
XTYPE='PK'
OR
XTYPE='F'
order by
parent_obj
-- definindo o cursor...

-- apagando as constraints...
open constraint_id
open parent_obj
fetch next from parent_obj into @prt_obj
fetch next from constraint_id into @const_id
set @parent_name = (select name from sysobjects where id=@prt_obj )
set @const_name = (select name from sysobjects where id=@const_id)
select @alter_table_statement = 'alter table '+ ltrim(rtrim(@parent_name)) + ' drop constraint ' + ltrim(rtrim(@const_name))
exec(@alter_table_statement)
while @@Fetch_Status = 0
begin
fetch next from parent_obj into @prt_obj
fetch next from constraint_id into @const_id
set @parent_name = (select name from sysobjects where id=@prt_obj )
set @const_name = (select name from sysobjects where id=@const_id)
select @alter_table_statement = ('alter table '+ ltrim(rtrim(@parent_name)) + ' drop constraint ' + ltrim(rtrim(@const_name)))
exec(@alter_table_statement)
end
close constraint_id
close parent_obj


-- desalocando o cursor...
deallocate table_name_cursor
deallocate constraint_id
deallocate parent_obj

The problem is that this script doesn't complete it's action because of constraint reference problem.
The constraint 'PK__justification__0FEC5ADD' is being referenced by table 'justification', foreign key constraint 'FK6F298AF2E0E77479'.
Can I turn off this constraint verification?
Or there is another way to delete this constraints?