CUSIP No. 230215105  Page 10  of  10 

EXHIBIT A

JOINT FILING AGREEMENT

     Fountainhead Partners, L.P., Durango Investments L.P., Rand Financial Inc. and Scott Rand, in compliance with Rule 13d-1(k) of the Securities and Exchange Commission, hereby agree that the statement on Schedule 13D to which this Agreement is attached as an exhibit is, and any amendments thereto filed by any of us will be, filed on behalf of each such company, that each such company is responsible for the timely filing of the Schedule 13D and any amendments thereto and for the completeness and accuracy of the information concerning such company contained therein.

Dated: June 29, 2007

/s/ Scott Rand Signature

Scott Rand Name/Title

For himself and as authorized signatory for each of:
Fountainhead Partners L.P., Durango Investments L.P.
and Rand Financial Inc.

End of Filing