Cash Type Gift?

Hi all you brides out there, I`m going to a wedding tomorrow (3/6/04) and intend to give a monetary gift. Do you suggest cash, or a check? And if I give a check, who should I make it out to?

I`ve purchased a small bridal type picture frame, and want to include the monetary gift with the frame and a card - but I`m concerned if I give cash it may be overlooked somehow (like slip out of the gift while they`re opening it, and then nobody will know where it came from) but don`t want to make more work for them...

Thanks for any feedback you can give, I`ll watch for feedback today. Otherwise, good luck to all out there!