|  | * | Registration                statement on Form S-8, SEC file number 333-63822, as filed with the                Securities and Exchange Commission on June 25,                2001, |
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|  | * | Registration                statement on Form S-3, SEC file number 333-63792, as declared effective                by                the Securities and Exchange Commission on July 2,                2001, |
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|  | * | Registration                statement on Form S-8, SEC file number 333-64588, as filed with the                Securities and Exchange Commission on July 3,                2001, |
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|  | * | Registration                statement on Form S-3, SEC file number 333-71308, as declared effective                by                the Securities and Exchange Commission on November 14,                2001, |
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|  | * | Registration                statement on Form S-3, SEC file number 333-89042, as declared effective                by                the Securities and Exchange Commission on June 7,                2002, |
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|  | * | Registration                statement on Form S-3, SEC file number 333-18819, as declared effective                by                the Securities and Exchange Commission on July 30,                2002, |
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|  | * | Registration                statement on Form S-3, SEC file number 333-92064, as declared effective                by                the Securities and Exchange Commission on August 21,                2002, |
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|  | * | Registration                statement on Form S-3, SEC file number 333-104588, as declared effective                by the Securities and Exchange Commission on May 2,                2003, |
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|  | * | Registration                statement on Form S-3, SEC file number 333-106516, as declared effective                by the Securities and Exchange Commission on September 2, 2003, |
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|  | * | Registration                statement on Form S-3, SEC file number 333-110142, as declared effective                by the Securities and Exchange Commission on November 12, 2003,                and |
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|  | * | Registration                statement on Form S-3, SEC file number 333-124002, as declared effective                by the Securities and Exchange Commission on June 29,                2005. |
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|  | * | Registration                statement on Form S-3, SEC file number 333-134900, as declared effective                by the Securities and Exchange Commission on July 26,                2006. |
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