EXHIBIT 99.1A JOINT FILING UNDERTAKING The undersigned, being authorized thereunto, hereby execute this agreement as an exhibit to this Schedule 13G to evidence the agreement of the below-named parties, in accordance with rules promulgated pursuant to...

                                                                  EXHIBIT 99.1A


                            JOINT FILING UNDERTAKING

                  The undersigned, being authorized thereunto, hereby execute
this agreement as an exhibit to this Schedule 13G to evidence the agreement of
the below-named parties, in accordance with rules promulgated pursuant to the
Securities Exchange Act of 1934, to file this Schedule, as it may be amended,
jointly on behalf of each of such parties.

DATED:  February 9, 2001.






                                                    

H&Q LONDON VENTURES                                      H&Q VENTURE PARTNERS, LLC



By: /s/ XXXXXX X. XXXXXXXXXXXX                           By: /s/ XXXXXXX X. XXXXXXXXXXX
   --------------------------------                         --------------------------------
        Xxxxxx X. Xxxxxxxxxxxx                                   Xxxxxxx X. Xxxxxxxxxxx
        Attorney-In-Fact                                         Member-Manager

XXXXXXXXX & XXXXX VENTURE PARTNERS                       XXXXXXXXX & XXXXX CALIFORNIA



By: /s/ XXXXXX X. XXXXXXXXXXXX                           By: /s/ XXXXXX X. XXXXXXXXXX
   --------------------------------                         --------------------------------
        Xxxxxx X. Xxxxxxxxxxxx                                   Xxxxxx X. Xxxxxxxxxx
        Attorney-In-Fact                                         General Counsel & Secretary