INTALATION ERROR PLEASE HELP

why i am getting this error message?



Warning: mysql_query() [function.mysql-query]: Access denied for user 'videozoo'@'localhost' (using password: NO) in /home/videozoo/public_html/include/function.php on line 8

Warning: mysql_query() [function.mysql-query]: A link to the server could not be established in /home/videozoo/public_html/include/function.php on line 8
ERROR: Unable to execute query

SELECT * from signup where username='omar' and pwd='62b891fc87d0953882fca36c87fc5c18'
Access denied for user 'videozoo'@'localhost' (using password: NO)

Your database details are not correct

Database login details in config.php is wrong or the file not exists.