Exhibit 2

POWER OF ATTORNEY

Know all men by these presents that Edward A. Gilhuly does hereby make, constitute and appoint William J. Janetschek and Richard J. Kreider, or either one of them, as a true and lawful attorney-in-fact of the undersigned with full powers of substitution and revocation, for and in the name, place and stead of the undersigned (both in the undersigned’s individual capacity and as a member of any limited liability company or limited partnership for which the undersigned is otherwise authorized to sign), to execute and deliver such forms as may be required to be filed from time to time with the Securities and Exchange Commission with respect to any investments of KKR Associates, L.P., KKR Associates 1996 L.P., KKR Associates II (1996) Limited Partnership, KKR Associates (Strata) L.P., KKR Associates (KLC) L.P., and KKR Associates (NXS) L.P. (including any amendments or supplements to any reports, forms or schedules previously filed by such persons or entities): (i) pursuant to Sections 13(d) and 16(a) of the Securities Exchange Act of 1934, as amended (the “Act”), including without limitation, Schedule 13D, Schedule 14G, statements on Form 3, Form 4 and Form 5 and (ii) in connection with any applications for EDGAR access codes, including without limitation the Form ID.

/s/ Edward A. Gilhuly

Name: Edward A. Gilhuly

September 29, 1999

Date