PHP error happened

Technical information
Error type2
Error descriptionmysql_connect() [function.mysql-connect]: Unknown MySQL server host 'server-mysql1' (1)
URLsampsonvets.com/FIS13/member_list.php?goto=51
Error file/hermes/walnaweb02a/b466/hy.sampsonvets/FIS13/include/dbconnection.php
Error line9
SQL query