Samsung SGH-T609

Everytime I try to send a ringtone to my friend via bluetooth, the option to send via bluetooth is not highlighted on the ringtones that I have downloaded from T Zones. Does anyone know how to do that? Is there a certain way I need to save it? Also, i have sent a couple of MP3's to my phone from my lap top via bluetooth and I have saved them .3gp just like on the T809 to enable me to save them as a ring tone, but it is not working. Does anyone know why? Is it because I sent it via bluetooth from my lap top? HELP!!! 😕