|  | *  | Registration      statement on Form S-8, SEC file number 333-63822, as filed with the      Securities and Exchange Commission on June 25,  2001, |
|--|---------|--------------------------------------------------------------------------------------------------------------------------------------------------|

|  | *  | Registration      statement on Form S-3, SEC file number 333-63792, as declared effective by      the Securities and Exchange Commission on July 2,  2001, |
|--|---------|------------------------------------------------------------------------------------------------------------------------------------------------------------|

|  | *  | Registration      statement on Form S-8, SEC file number 333-64588, as filed with the      Securities and Exchange Commission on July 3,  2001, |
|--|---------|-------------------------------------------------------------------------------------------------------------------------------------------------|

|  | *  | Registration      statement on Form S-3, SEC file number 333-71308, as declared effective by      the Securities and Exchange Commission on November 14,    2001, |
|--|---------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|  | *  | Registration      statement on Form S-3, SEC file number 333-89042, as declared effective by      the Securities and Exchange Commission on June 7,  2002, |
|--|---------|------------------------------------------------------------------------------------------------------------------------------------------------------------|

|  | *  | Registration      statement on Form S-3, SEC file number 333-18819, as declared effective by      the Securities and Exchange Commission on July 30,  2002, |
|--|---------|-------------------------------------------------------------------------------------------------------------------------------------------------------------|

|  | *  | Registration      statement on Form S-3, SEC file number 333-92064, as declared effective by      the Securities and Exchange Commission on August 21,  2002, |
|--|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------|

|  | *  | Registration      statement on Form S-3, SEC file number 333-104588, as declared effective      by the Securities and Exchange Commission on May 2,  2003, |
|--|---------|------------------------------------------------------------------------------------------------------------------------------------------------------------|

|  | *  | Registration      statement on Form S-3, SEC file number 333-106516, as declared effective      by the Securities and Exchange Commission on September 2,      2003, |
|--|---------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|  | *  | Registration      statement on Form S-3, SEC file number 333-110142, as declared effective      by the Securities and Exchange Commission on November 12,      2003, |
|--|---------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|  | *  | Registration      statement on Form S-3, SEC file number 333-124002, as declared effective      by the Securities and Exchange Commission on June 29,  2005, |
|--|---------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|

|  | *  | Registration      statement on Form S-3, SEC file number 333-134900, as declared effective      by the Securities and Exchange Commission on July 26, 2006,      and |
|--|---------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|  | *  | Registration      statement on Form S-3, SEC file number 333-143287, as declared effective      by the Securities and Exchange Commission on June 14,  2007. |
|--|---------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|

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