Ms Suu Kyi will spend her 64th birthday on Friday in Yangon's notorious Insein prison, facing charges of violating terms of her house arrest by harbouring an American who swam uninvited to her lakeside home.

The ruling junta is widely expected to deliver a guilty verdict, which could put the Nobel Peace Prize laureate in prison for up to five years. She has already spent more than 13 of the last 19 years under house arrest.

'We must not stand by as she is silenced again. Now is the time for the international community to speak with one voice,' Roberts wrote as part of a campaign - '64 words for Aung San Suu Kyi' - organised by a coalition of human rights and activist groups.

The campaign, launched on May 27, asks Ms Suu Kyi's supporters to tweet, write text messages or send video and photos to its website, http: 64forsuu.org.

Similar campaigns on Ms Suu Kyi's past birthdays and other milestones generated some global publicity for her cause but have failed to change the military junta's harsh attacks on all signs of dissent. Myanmar, also known as Burma, has been dominated by the military since 1962.

Actress Demi Moore, actor Kevin Spacey, artist Yoko Ono and British Prime Minister Gordon Brown were among the contributors to the website.

In a parallel campaign, the organisers have to date gathered the signatures of 107 former or current political prisoners from over 20 countries calling for the release of political prisoners in Myanmar and calling on the UN Security Council to impose a global arms embargo on the South-east Asian nation.

The signatories include Kim Dae Jung, a former South Korean president and Nobel Peace Prize laureate; Shirin Ebadi, an Iranian human rights campaigner who also won the prize; former Czech President Vaclav Havel; and two female Chinese activists currently under house arrest, Yuan Weijing and Zeng Jinyan.

Anwar Ibrahim, former deputy prime minister of Malaysia, urged the Association of South-east Asian Nations to lift its policy of nonintervention in Myanmar, which is a member of the 10-nation bloc. -- AP