EXHIBIT 1 --------- AGREEMENT AS TO JOINT FILING OF SCHEDULE 13G -------------------------------------------- Each of the undersigned hereby affirms that it is individually eligible to use Schedule 13G, and agrees that this Schedule 13G is filed on its behalf. Date: January 5, 2006 CITIGROUP GLOBAL MARKETS INC. By: /s/ Ali L. Karshan -------------------------------------------- Name: Ali L. Karshan Title: Assistant Secretary CITIGROUP FINANCIAL PRODUCTS INC. By: /s/ Ali L. Karshan -------------------------------------------- Name: Ali L. Karshan Title: Assistant Secretary CITIGROUP GLOBAL MARKETS HOLDINGS INC. By: /s/ Ali L. Karshan -------------------------------------------- Name: Ali L. Karshan Title: Assistant Secretary CITIGROUP INC. By: /s/ Ali L. Karshan -------------------------------------------- Name: Ali L. Karshan Title: Assistant Secretary