Is there a way to send ring tones from a Blackjack II (AT&T) to a Chocolate(Verizon)?

A friend of mine sent me some ring tones from myxer that she wanted. Verizon blocks all the free ring tones on there. I got the ring tones downloaded to my phone(the blackjack), but cannot transfer them to hers(the chocolate). Does anyone know how to get them sent?