Leaders look on as the EU flag and flags of the 25 EU members rise during the EU expansion ceremony held in Dublin, Ireland, May 1, 2004. World leaders gathered in Dublin to hail the historic expansion of EU on Saturday.

Leaders look on as the EU flag and flags of the 25 EU members rise during the EU expansion ceremony held in Dublin, Ireland, May 1, 2004. World leaders gathered in Dublin to hail the historic expansion of EU on Saturday.

Leaders of EU and 25 EU member states pose for a group photo during the EU expansion ceremony held in Dublin, Ireland, May 1, 2004.

The EU flag and flags of the 25 EU members rise on the EU expansion ceremony held in Dublin, Ireland, May 1, 2004.

French President Jacques Chirac (R) and British Prime Minister Tony Blair are interviewed by media as they attend the EU expansion ceremony

Spanish Prime Minister Jose Luis Zapatero (R) and Slovenian Premier Anton Rop (L) attend the EU expansion ceremony.

Irish Prime Minister Berty Ahern (L) greets Czech Premier Vladimir Spidla as he arrives for the EU expansion ceremony

Irish Prime Minister Berty Ahern (L) greets Latvian President Vaira Vike-Freiberga as she arrives for the EU expansion ceremony

Irish Prime Minister Berty Ahern (L) greets German Chancellor Gerhard Schroeder as he arrives for the EU expansion ceremony.