ACCRA, Jan 11 (Reuters) - Former U.N. Secretary General Kofi Annan on Friday called on Kenya's president and opposition leader to cooperate with African mediators to quickly resolve the political crisis in the East African country.

Annan, who said he had a accepted a mission to lead a panel of African personalities to mediate in Kenya, said he hoped to move as quickly as possible, but gave no time frame.

"Political negotiation is not an event, it is a process that can take a very long time, or a short time -- all depends on the cooperation of the leaders," Annan said in Accra after holding talks there with African Union Chairman and Ghanaian President John Kufuor.

Kufuor had announced Annan's role in Nairobi on Thursday after his own mediation trip to Kenya failed to broker an immediate reconciliation between Kenyan President Mwai Kibaki and opposition chief Raila Odinga.

Around 500 people have been killed in political and ethnic violence in Kenya after a disputed Dec. 27 poll that Odinga says Kibaki rigged to achieve re-election.

Annan said he had already begun talking with the other members of the panel - Graca Machel, wife of former South African President Nelson Mandela, and former Tanzanian President Ben Mkapa -- about setting up a secretariat for the Kenya mediation mission.

"I regard it as a great responsibility and we'll take it seriously in order to restore stability and quickly end the humanitarian crisis in that country," Annan added.

"We are not going to impose solutions but work together with (Kibaki and Odinga) to arrive at viable and long-lasting solutions to the problem," he said. (Reporting by Kwasi Kpodo; Editing by Pascal Fletcher)

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