Thailand's judiciary delivered another blow to the country's shaky coalition government Wednesday when the Constitution Court found acting Health Minister Chaiya Sasomsap guilty of asset concealment, forcing him to quit his post.

The Constitution Court found Chaiya guilty of failing to fully declare his wife's shareholdings in a company within 30 days after assuming the post of health minister, as is required under the Thai constitution.

The court's verdict, which included a five-year ban from politics, was the latest of many blows delivered by the judiciary to Thailand's tottering coalition government under the helmsmanship of Prime Minister Samak Sundaravej, who heads the People Power Party (PPP).

On Tuesday the Constitution Court found Thai Foreign Minister Noppodon Pattama guilty of infringing the charter by signing a joint communique with Cambodia on June 18 on the joint listing of Preah Vihear temple, an ancient Hindu temple on the Thai-Cambodian border, as a World Heritage site at UNESCO.

Under the Thai constitution of 2007, any treaty or bilateral agreement that effects national security of sovereignty must be approved by parliament before being signed.

Noppodon signed the document with the cabinet's approval but not parliament's and is now facing an impeachment motion lodged by the opposition, which may include the entire cabinet.

Also on Tuesday the Supreme Court for political offences found former House Speaker Yongyudh Tiyapairat guilty of committing election fraud in the December 23, 2007 polls. He allegedly bribed ten village head men to muster votes for his sister La-ong in the election.

Yongyudh, a deputy leader of the PPP, lost his status as as an elected member of parliament and was banned from politics for five years. His sister also lost her seat.

Noppodon and Chaiya are both senior members of the PPP, which won the most seats in the December 23, 2007, polls. It campaigned on the platform of reintroducing the populist policies of Thaksin Shinawatra, who was premier between 2001 to 2006 before being toppled by a coup on corruption charges.

The PPP has made no secret of its close ties to Thaksin and 110 of his close political allies, all of whom have been banned from politics by a constitutional court decision last year.

Widely seen as a 'nominee' cabinet for Thaksin and his cronies, the PPP has been accused of neglected the country's problems and concentrating its efforts on returning Thaksin to power and benefiting his business interests.

Thaksin and his wife also face several corruption trials that are now underway.

The judicial bashing of the executive is expected to soon lead to dissolution of parliament or a cabinet reshuffle.

'I have proposed that Samak dissolve parliament, and a lot of MPs agree with me,' said Karn Thienkeow, a deputy leader of the PPP.

The PPP will meet Thursday to discuss the matter, Karn told reporters after the verdict on Chaiya was read out.