Dropping a constraint in MS SQL Server

Hi All,
Does anybody know if there's a way to check if a constraint
exists before dropping it?
In other words, how do I check if constraint
"FK_Products1_ID" exists before dropping it (see below) so I won't
get the error " 'FK_Products1_ID' is not a constraint. Could not
drop constraint"
ALTER TABLE Products2_Table DROP CONSTRAINT FK_Products1_ID
Thanks in advance!

Thank you very much, Ken. It works.
The correct syntax:
IF EXISTS (select * from dbo.sysobjects where name =
'FK_Products1_ID')
BEGIN
ALTER TABLE Products2_Table DROP CONSTRAINT FK_Products1_ID
END
Sorry about not mentioning what version of sql server.
Yes, I'm using version 2k.

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