The Company’s stockholders previously approved each of the Company’s 1992, 1996, 2001, 2003 and 2006 Stock Option Plans. The following table sets forth certain information concerning aggregate stock options authorized for issuance under the Company’s 1996, 2001, 2003 and 2006 Stock Option Plans as of May 31, 2006.

Shares of common stock issuable on the exercise of warrants have not been approved by the Company’s stockholders and, accordingly, have been segregated in the table below.