Exhibit 99.1 AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13D Safeguard Scientifics, Inc., Safeguard Delaware, Inc., and Safeguard Scientifics (Delaware), Inc. hereby agree that the Amendment #4 to Statement on Schedule 13D to which this agreement...

                                                                    Exhibit 99.1

              AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13D

Safeguard Scientifics, Inc., Safeguard Delaware, Inc., and Safeguard Scientifics
(Delaware), Inc. hereby agree that the Amendment #4 to Statement on Schedule 13D
to which this agreement is attached, as well as all future amendments to such
statement, shall be filed jointly on behalf of each of them. This agreement is
intended to satisfy the requirements of Rule 13d-1(k)(1)(iii) under the
Securities Exchange Act of 1934, as amended.

Date:  March 31, 2005                   Safeguard Scientifics, Inc.


                                        By:      XXXXXX X. XXXXX
                                             ----------------------------
                                                 Xxxxxx X. Xxxxx
                                                 Senior Vice President and
                                                 General Counsel

Date:  March 31, 2005                   Safeguard Delaware, Inc.

                                        By:      XXXXXX X. XXXXX
                                             ----------------------------
                                                 Xxxxxx X. Xxxxx
                                                 Vice President

Date:  March 31, 2005                   Safeguard Scientifics (Delaware), Inc.

                                        By:      XXXXXX X. XXXXX
                                             ----------------------------
                                                 Xxxxxx X. Xxxxx
                                                 Vice President