EXHIBIT 24**POWER OF ATTORNEY**     Know all men by these presents, that the undersigned constitutes and appoints Stephen L. Wayand Edward H. Ellis, Jr., and each of them, his true and lawful attorney-in-fact and agent, withfull power of substitution and re-substitution, for him and in his name, place and stead, in anyand all capacities, to sign this Annual Report on Form 10-K and any and all amendments thereto, andto file same, with all exhibits thereto, and other documents in connection therewith, with theSecurities and Exchange Commission, granting unto such attorneys-in-fact and agents, and each ofthem, full power and authority to do and perform each and every act and thing requisite andnecessary to be done in and about the premises, as fully to all intents and purposes as he might orcould do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents orany of the, or their or his substitute or substitutes, may lawfully do or cause to be done byvirtue hereof.         /s/ FRANK J. BRAMANTI   Frank J. Bramanti   Date:  March 10, 2006   
 

 
**POWER OF ATTORNEY**     Know all men by these presents, that the undersigned constitutes and appoints Stephen L. Wayand Edward H. Ellis, Jr., and each of them, his true and lawful attorney-in-fact and agent, withfull power of substitution and re-substitution, for him and in his name, place and stead, in anyand all capacities, to sign this Annual Report on Form 10-K and any and all amendments thereto, andto file same, with all exhibits thereto, and other documents in connection therewith, with theSecurities and Exchange Commission, granting unto such attorneys-in-fact and agents, and each ofthem, full power and authority to do and perform each and every act and thing requisite andnecessary to be done in and about the premises, as fully to all intents and purposes as he might orcould do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents orany of the, or their or his substitute or substitutes, may lawfully do or cause to be done byvirtue hereof.         /s/ PATRICK B. COLLINS   Patrick B. Collins   Date:  March 10, 2006   
 

 
**POWER OF ATTORNEY**     Know all men by these presents, that the undersigned constitutes and appoints Stephen L. Wayand Edward H. Ellis, Jr., and each of them, his true and lawful attorney-in-fact and agent, withfull power of substitution and re-substitution, for him and in his name, place and stead, in anyand all capacities, to sign this Annual Report on Form 10-K and any and all amendments thereto, andto file same, with all exhibits thereto, and other documents in connection therewith, with theSecurities and Exchange Commission, granting unto such attorneys-in-fact and agents, and each ofthem, full power and authority to do and perform each and every act and thing requisite andnecessary to be done in and about the premises, as fully to all intents and purposes as he might orcould do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents orany of the, or their or his substitute or substitutes, may lawfully do or cause to be done byvirtue hereof.         /s/ JAMES R. CRANE   James R. Crane   Date:  March 10, 2006   
 

 
**POWER OF ATTORNEY**     Know all men by these presents, that the undersigned constitutes and appoints Stephen L. Wayand Edward H. Ellis, Jr., and each of them, his true and lawful attorney-in-fact and agent, withfull power of substitution and re-substitution, for him and in his name, place and stead, in anyand all capacities, to sign this Annual Report on Form 10-K and any and all amendments thereto, andto file same, with all exhibits thereto, and other documents in connection therewith, with theSecurities and Exchange Commission, granting unto such attorneys-in-fact and agents, and each ofthem, full power and authority to do and perform each and every act and thing requisite andnecessary to be done in and about the premises, as fully to all intents and purposes as he might orcould do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents orany of the, or their or his substitute or substitutes, may lawfully do or cause to be done byvirtue hereof.         /s/ J. ROBERT DICKERSON   J. Robert Dickerson   Date:  March 10, 2006   
 

 
**POWER OF ATTORNEY**     Know all men by these presents, that the undersigned constitutes and appoints Stephen L. Wayand Edward H. Ellis, Jr., and each of them, his true and lawful attorney-in-fact and agent, withfull power of substitution and re-substitution, for him and in his name, place and stead, in anyand all capacities, to sign this Annual Report on Form 10-K and any and all amendments thereto, andto file same, with all exhibits thereto, and other documents in connection therewith, with theSecurities and Exchange Commission, granting unto such attorneys-in-fact and agents, and each ofthem, full power and authority to do and perform each and every act and thing requisite andnecessary to be done in and about the premises, as fully to all intents and purposes as he might orcould do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents orany of the, or their or his substitute or substitutes, may lawfully do or cause to be done byvirtue hereof.         /s/ WALTER M. DUER   Walter M. Duer   Date:  March 10, 2006   
 

 
**POWER OF ATTORNEY**     Know all men by these presents, that the undersigned constitutes and appoints Stephen L. Wayand Edward H. Ellis, Jr., and each of them, his true and lawful attorney-in-fact and agent, withfull power of substitution and re-substitution, for him and in his name, place and stead, in anyand all capacities, to sign this Annual Report on Form 10-K and any and all amendments thereto, andto file same, with all exhibits thereto, and other documents in connection therewith, with theSecurities and Exchange Commission, granting unto such attorneys-in-fact and agents, and each ofthem, full power and authority to do and perform each and every act and thing requisite andnecessary to be done in and about the premises, as fully to all intents and purposes as he might orcould do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents orany of the, or their or his substitute or substitutes, may lawfully do or cause to be done byvirtue hereof.         /s/ JAMES C. FLAGG   James C. Flagg, PhD.   Date:  March 10, 2006   
 

 
**POWER OF ATTORNEY**     Know all men by these presents, that the undersigned constitutes and appoints Stephen L. Wayand Edward H. Ellis, Jr., and each of them, his true and lawful attorney-in-fact and agent, withfull power of substitution and re-substitution, for him and in his name, place and stead, in anyand all capacities, to sign this Annual Report on Form 10-K and any and all amendments thereto, andto file same, with all exhibits thereto, and other documents in connection therewith, with theSecurities and Exchange Commission, granting unto such attorneys-in-fact and agents, and each ofthem, full power and authority to do and perform each and every act and thing requisite andnecessary to be done in and about the premises, as fully to all intents and purposes as he might orcould do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents orany of the, or their or his substitute or substitutes, may lawfully do or cause to be done byvirtue hereof.         /s/ ALLAN W. FULKERSON   Allan W. Fulkerson   Date:  March 10, 2006   
 

 
**POWER OF ATTORNEY**     Know all men by these presents, that the undersigned constitutes and appoints Stephen L. Wayand Edward H. Ellis, Jr., and each of them, his true and lawful attorney-in-fact and agent, withfull power of substitution and re-substitution, for him and in his name, place and stead, in anyand all capacities, to sign this Annual Report on Form 10-K and any and all amendments thereto, andto file same, with all exhibits thereto, and other documents in connection therewith, with theSecurities and Exchange Commission, granting unto such attorneys-in-fact and agents, and each ofthem, full power and authority to do and perform each and every act and thing requisite andnecessary to be done in and about the premises, as fully to all intents and purposes as he might orcould do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents orany of the, or their or his substitute or substitutes, may lawfully do or cause to be done byvirtue hereof.         /s/ WALTER J. LACK   Walter J. Lack   Date:  March 10, 2006   
 

 
**POWER OF ATTORNEY**     Know all men by these presents, that the undersigned constitutes and appoints Stephen L. Wayand Edward H. Ellis, Jr., and each of them, his true and lawful attorney-in-fact and agent, withfull power of substitution and re-substitution, for him and in his name, place and stead, in anyand all capacities, to sign this Annual Report on Form 10-K and any and all amendments thereto, andto file same, with all exhibits thereto, and other documents in connection therewith, with theSecurities and Exchange Commission, granting unto such attorneys-in-fact and agents, and each ofthem, full power and authority to do and perform each and every act and thing requisite andnecessary to be done in and about the premises, as fully to all intents and purposes as he might orcould do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents orany of the, or their or his substitute or substitutes, may lawfully do or cause to be done byvirtue hereof.         /s/ JOHN N. MOLBECK, JR.    John N. Molbeck, Jr.   Date:  March 10, 2006   
 

 
**POWER OF ATTORNEY**     Know all men by these presents, that the undersigned constitutes and appoints Stephen L. Wayand Edward H. Ellis, Jr., and each of them, his true and lawful attorney-in-fact and agent, withfull power of substitution and re-substitution, for him and in his name, place and stead, in anyand all capacities, to sign this Annual Report on Form 10-K and any and all amendments thereto, andto file same, with all exhibits thereto, and other documents in connection therewith, with theSecurities and Exchange Commission, granting unto such attorneys-in-fact and agents, and each ofthem, full power and authority to do and perform each and every act and thing requisite andnecessary to be done in and about the premises, as fully to all intents and purposes as he might orcould do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents orany of the, or their or his substitute or substitutes, may lawfully do or cause to be done byvirtue hereof.         /s/ MICHAEL A. F. ROBERTS    Michael A. F. Roberts   Date:  March 10, 2006