Exhibit 99.(b)

EXHIBIT B

Power of Attorney

The undersigned hereby make, constitute and appoint each of Edward F. Glassmeyer and Ann H. Lamont, acting jointly or individually, with full power of substitution, the true and lawful attorney-in-fact for the undersigned, in the undersigned’s name, place and stead and on the undersigned’s behalf, to complete, execute and file with the United States Securities and Exchange Commission (the “Commission”), a statement on Schedule 13G with respect to the securities of any or all of the following entities:

aQuantive, Inc., a Washington corporation;

Concur Technologies, Inc., a Delaware corporation;

InterNAP Network Services Corporation, a Delaware corporation;

and any and all amendments thereto pursuant to Section 13(d) of the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder, and any other forms, certificates, documents or instruments (including a Joint Filing Agreement) that the attorneys-in-fact (or either of them) deems necessary or appropriate in order to enable the undersigned to comply with the requirements of said Section 13(d) and said rules and regulations.

This Power of Attorney shall remain in effect for a period of two years from the date hereof or until such earlier date as a written revocation thereof is filed with the Commission.

Dated: February 9, 2004

Oak Management Corporation
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  President
Oak Investment Partners VI, Limited Partnership
By: Oak Associates VI, LLC, its general partner
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak Associates VI, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak VI Affiliates Fund, Limited Partnership
By:  Oak VI Affiliates, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak VI Affiliates, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak Investment Partners VII, Limited Partnership
By: Oak Associates VII, LLC, its general partner
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member

Oak Associates VII, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak VII Affiliates Fund, Limited Partnership
By:  Oak VII Affiliates, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak VII Affiliates, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak Investment Partners VIII, Limited Partnership
By: Oak Associates VIII, LLC, its general partner
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak Associates VIII, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak VIII Affiliates Fund, Limited Partnership
By:  Oak VIII Affiliates, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member

Oak VIII Affiliates, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak Investment Partners IX, Limited Partnership
By: Oak Associates IX, LLC, its general partner
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak Associates IX, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak IX Affiliates Fund - A, Limited Partnership
By:  Oak IX Affiliates, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak IX Affiliates Fund, Limited Partnership
By:  Oak IX Affiliates, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member

Oak IX Affiliates, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak Investment Partners X, Limited Partnership
By: Oak Associates X, LLC, its general partner
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak Associates X, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak X Affiliates Fund, Limited Partnership
By:  Oak X Affiliates, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
Oak X Affiliates, LLC
By:	/s/ Edward F. Glassmeyer
	Name:  Edward F. Glassmeyer
	Title:  Managing Member
/s/ Bandel L. Carano
	Bandel L. Carano
/s/ Gerald R. Gallagher
	Gerald R. Gallagher

/s/ Edward F. Glassmeyer
	Edward F. Glassmeyer
/s/ Fredric W. Harman
	Fredric W. Harman
/s/ Ann H. Lamont
	Ann H. Lamont
/s/ David B. Walrod
	David B. Walrod