PURCHASE NOTE

Exhibit 10.68

PURCHASE NOTE

December 12, 2001

$2,660,517.63

FOR VALUE RECEIVED, the undersigned, Malon Wilkus (the “Optionee”), hereby promises to pay to AMERICAN CAPITAL STRATEGIES, LTD., and its successors and assigns (the “Holder”), the principal sum of TWO MILLION SIX HUNDRED SIXTY THOUSAND FIVE HUNDRED SEVENTEEN AND 63/100 DOLLARS ($2,660,517.63), with interest thereon, on the terms and conditions set forth in the Exercise Agreement (as defined herein).

Payments of the principal of and interest on this Note are to be made in lawful money of the United States of America by check mailed and addressed to the Holder hereof at the address shown in the Exercise Agreement or such other address as may be provided thereunder.

Notwithstanding any provision to the contrary in this Note, the Exercise Agreement or any other agreement, the Optionee sha