A cleaner conned seven colleagues out of nearly $580,000 by claiming she could help them invest in the stock market, a court heard yesterday. Instead, Chan Sui-ling, 38, used the funds to buy shares for her herself, prosecutor Vivien Chan Man-wai said. Chan yesterday admitted in the District Court to 20 charges of deception. Chan told colleagues at Hong Kong Air Cargo Terminals Company Limited that she could buy profitable shares because she had insider information. Between May and August 1997, the victims deposited a total of $574,575 into Chan's bank account. But none of the cleaners received any records of the shares. In October 1997, the victims could not contact Chan and went to the police. Deputy Judge Stephen Geiser adjourned sentencing until September 8.