Warning: mysql_query(): Access denied for user ''@'localhost' (using password: NO) in /home/sactr/public_html/course.php on line 17

Warning: mysql_query(): A link to the server could not be established in /home/sactr/public_html/course.php on line 17
---error---
Warning: mysql_errno() expects parameter 1 to be resource, null given in /home/sactr/public_html/course.php on line 19

Warning: mysql_error() expects parameter 1 to be resource, null given in /home/sactr/public_html/course.php on line 19
---error---