Autodial – Internet sharing

The server ( host ) computer is a win xp machine with internet sharing enable ( isdn modem & line )and the workstations is win 98 machines. All of them connect very well. The host machine wants to stay online , after disconnecting – it connects again. There is no time interval of connecting – the machine just connect and stay online. All the settings is ok. (Please help – The telephone account is now overdue )
Thank You
Pieter