Warning: mysql_query() [function.mysql-query]: Access denied for user 'unixtool'@'localhost' (using password: NO) in /home/unixtool/public_html/software/include/settings.php on line 5

Warning: mysql_query() [function.mysql-query]: A link to the server could not be established in /home/unixtool/public_html/software/include/settings.php on line 5
MySQL Problem;
File : /home/unixtool/public_html/software/include/settings.php
Line 6
Error : Access denied for user 'unixtool'@'localhost' (using password: NO)