An election campaign worker yesterday admitted writing swear words on a DAB advertisement board after being fired. Alan Leung Koon-lun, 30, who said he was a Democratic Party member, used a blue marker pen last Saturday to write the Chinese words 'f***doom the whole family' on an advertisement featuring a photograph of chairman Ma Lik and other candidates from the pro-government Democratic Alliance for Betterment of Hong Kong. He was later caught by police in Electric Road, North Point. Leung's lawyer told Eastern Court his client had been fired that day from his job as a campaign worker for independent candidate Lau Yuk-shing in Kowloon West. He was venting his anger by writing on the board. Leung admitted causing criminal damage and was bound over in the sum of $500 to be of good behaviour for 12 months. He also had to pay the DAB $100 for damaging the board and $500 to the prosecution for court fees. Sentencing him, Principal Magistrate Ian Candy said it was good that Leung was interested in politics and that he and other people should be encouraged to express their views. 'But no matter how strongly you disagree with other parties, they have the right to express their views just like you do,' Mr Candy added. 'It is inappropriate, immature and even juvenile to express your feelings towards any political party by scribbling offensive, abusive characters on their election material.' Outside the court, Leung said he was a member of the Democratic Party and an anti-Tung political group. He had unsuccessfully contested a North Point seat in the district council election last year as an independent.