Hmm...
You're obviously doing something wrong.
Perhaps that's a tad harsh, but if what I gave you isn't working, he's right in that it's not the code I gave you that is at fault. It is either your implementation of the code, or the unexpected possibility that something about the way things are being done (and I have no idea what, but could list half a dozen guesses, and I don't mean "things are being done that are your fault", I mean, maybe the server is case-sensitive and I should have put "Cc: " instead of "cc:", or maybe your editor is converting the newline characters which must be in the mail headers, or maybe the server's mail configuration doesn't allow cc'ing, or ... well, that's only 3, but you get the idea....)
There's simply no way anyone on the forum, without exact and more or less total knowledge of the situation and access to the code and server, can tell what your problem is from a couple of posts on the forum. Likely that goes for other forums as well. It may be you give up too easily. I can't say, I don't know you. Sometimes programming is like "kicking dead whales down the beach", though; and it may behoove us to persevere sometimes.
I can't say with one hundred percent certainty, but of all the forums on the 'Net that I read or visit that are concerned with PHP, this one is probably tops in terms of the quickness of response and the sheer number of knowledgeable posters. I'm not the most knowledgeable ... maybe someone will hand you the magic bullet later.
If you're in the U.S., I suggest you relax and enjoy the holiday, and hit it again Monday morning ... what I've shown you is, in essence, absolutely correct, is described in detail in the PHP manual, and is common knowledge among PHP programmers. "cc:" is a mail header, and headers are the fourth argument to mail() ....