<Page> EXHIBIT 99.906CERT This certification is provided pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, and accompanies the report on Form N-CSR for the period ended June 30, 2003 of Skyline Funds (the "Registrant"). I, William M. Dutton, President and Trustee of the Registrant, certify that, to the best of my knowledge: 1. the Form N-CSR fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and 2. the information contained in the Form N-CSR fairly presents, in all material respects, the financial condition and results of operations of the Registrant. /s/ William M. Dutton 08/29/03 - ------------------------------ -------------------------- William M. Dutton Date President and Trustee A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within electronic version of this written statement required by Section 906, has been provided to the registrant and will be retained by the Registrant and furnished to the SEC or its staff upon request. <Page> SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. (Registrant) Skyline Funds -------------------------------------------------------------------- By: /s/ William M. Dutton William M. Dutton, President and Trustee - Skyline Funds - -------------------------------------------------------------------------------- Date 08/29/03 ---------------------------------------------------------------------------- Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By: /s/ William M. Dutton William M. Dutton, President and Trustee - Skyline Funds - -------------------------------------------------------------------------------- Date 08/29/03 ---------------------------------------------------------------------------- By: /s/ William M. Dutton William M. Dutton, President and Trustee - Skyline Funds - -------------------------------------------------------------------------------- Date 08/29/03 ---------------------------------------------------------------------------- <Page> This certification is provided pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, and accompanies the report on Form N-CSR for the period ended June 30, 2003 of Skyline Funds (the "Registrant"). I, Stephen F. Kendall, Executive Vice President, Treasurer and Secretary of the Registrant, certify that, to the best of my knowledge: 1. the Form N-CSR fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and 2. the information contained in the Form N-CSR fairly presents, in all material respects, the financial condition and results of operations of the Registrant. /s/ Stephen F. Kendall 08/29/03 - ------------------------------ -------------------------- Stephen F. Kendall Date Executive Vice President, Treasurer and Secretary A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within electronic version of this written statement required by Section 906, has been provided to the registrant and will be retained by the Registrant and furnished to the SEC or its staff upon request. <Page> SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. (Registrant) Skyline Funds -------------------------------------------------------------------- By: /s/ Stephen F. Kendall Stephen F. Kendall, Executive Vice President, Treasurer and Secretary - Skyline Funds - -------------------------------------------------------------------------------- Date 08/29/03 ---------------------------------------------------------------------------- Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By: /s/ Stephen F. Kendall Stephen F. Kendall, Executive Vice President, Treasurer and Secretary - Skyline Funds - -------------------------------------------------------------------------------- Date 08/29/03 ---------------------------------------------------------------------------- By: /s/ Stephen F. Kendall Stephen F. Kendall, Executive Vice President, Treasurer and Secretary - Skyline Funds - -------------------------------------------------------------------------------- Date 08/29/03 ----------------------------------------------------------------------------