EX-99.1 2 ex-a.txt EXHIBIT A--JOINT FILING AGMT CUSIP NO. 4239109 13G PAGE 12 OF 12 PAGES Exhibit A to Schedule 13G Joint Filing Agreement Pursuant to Rule 13d-1(k) The undersigned persons (the "Reporting Persons") hereby agree that a joint statement on this Schedule 13G, and any amendments thereto, be filed on their behalf by ING Groep N.V. Each of the Reporting Persons is responsible for the completeness and accuracy of the information concerning each of them contained therein, but none of the Reporting Persons is responsible for the completeness or accuracy of the information concerning any other Reporting Person. Date: March 19, 2008 ING GROEP N.V. By: /s/ Eric E. Ribbers ----------------------------------- Name: Eric E. Ribbers Title: Senior Compliance Officer By: /s/ Klaas de Wit ----------------------------------- Name: Klaas de Wit Title: Head of Compliance Insiders ING BEWAAR MAATSCHAPPIJ I B.V. By: /s/ Eric E. Ribbers ----------------------------------- Name: Eric E. Ribbers Title: Authorized Signatory By: /s/ Klaas de Wit ----------------------------------- Name: Klaas de Wit Title: Authorized Signatory ING FUND MANAGEMENT B.V. By: /s/ Eric E. Ribbers ----------------------------------- Name: Eric E. Ribbers Title: Authorized Signatory By: /s/ Klaas de Wit ----------------------------------- Name: Klaas de Wit Title: Authorized Signatory