PHP error happened

Technical information
Error type2
Error descriptionmysql_connect() [function.mysql-connect]: Access denied for user 'leighton'@'localhost' (using password: YES)
URLwww.leightonbroadcasting.com/school/School_Closings_list.php?
Error file/home/www/leightonbroadcasting.com/htdocs/school/include/dbconnection.php
Error line9
SQL query