EXHIBIT F JOINT FILING AGREEMENT The undersigned do hereby acknowledge and agree that the Schedule 13D, of which this agreement is an exhibit, is filed on behalf of all of the undersigned. August 9, 2002. K2 VC, LTD. By: K2 VC MANAGEMENT, LLC By: /s/...

                                                                       EXHIBIT F

                             JOINT FILING AGREEMENT


         The undersigned do hereby acknowledge and agree that the Schedule 13D,
of which this agreement is an exhibit, is filed on behalf of all of the
undersigned.


August 9, 2002.



K2 VC, LTD.
By:      K2 VC MANAGEMENT, LLC


By:      /s/ XXXX XXXX
         ------------------------------
Name:    Xxxx Xxxx
Title:   President


K2 VC MANAGEMENT, LLC


By:      /s/ XXXX XXXX
         ------------------------------
Name:    Xxxx Xxxx
Title:   President


/s/ XXXX XXXX
---------------------------------------
Xxxx Xxxx



/s/ XXXXXX XXXXXXXX
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Xxxxxx Xxxxxxxx