Possible to exclude a folder from Dropbox (even though it's in Dropbox folder)?

I currently have my MAMP htdocs folder within my Dropbox folder (so I can sync files for different workstations). I also have a client that isn't comfortable with having their files on Dropbox. Anyone know if it's possible to exclude this one folder from Dropbox completely, even know it lives right there in the Dropbox folder? (Of course, moving the folder outside of Dropbox is easy enough, but then it's outside of my MAMP environment.) Is it possible to set up an alias or something? Is there something really simple I'm missing here? Any direction would be greatly appreciated.