Fix our connection problem with mysql for our site

fix our connection problem with mysql for our site
from today we are getting this messages when trying to connect to our site www.bestrent.co.il
all the lines except the first one is because i change the password of the mysq database in cpanel


Deprecated: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in /home/bestrent/public_html/system/database/mysql.php on line 6

Warning: mysql_connect(): Access denied for user 'bestrent_oc'@'localhost' (using password: YES) in /home/bestrent/public_html/system/database/mysql.php on line 6

Notice: Error: Could not make a database link using bestrent_oc@localhost in /home/bestrent/public_html/system/database/mysql.php on line 7

Warning: mysql_select_db() expects parameter 2 to be resource, boolean given in /home/bestrent/public_html/system/database/mysql.php on line 10

Notice: Error: Could not connect to database bestrent_oc in /home/bestrent/public_html/system/database/mysql.php on line 11

Warning: mysql_query() expects parameter 2 to be resource, boolean given in /home/bestrent/public_html/system/database/mysql.php on line 14

Warning: mysql_query() expects parameter 2 to be resource, boolean given in /home/bestrent/public_html/system/database/mysql.php on line 15

Warning: mysql_query() expects parameter 2 to be resource, boolean given in /home/bestrent/public_html/system/database/mysql.php on line 16

Warning: mysql_query() expects parameter 2 to be resource, boolean given in /home/bestrent/public_html/system/database/mysql.php on line 17

Warning: mysql_query() expects parameter 2 to be resource, boolean given in /home/bestrent/public_html/system/database/mysql.php on line 21

Warning: mysql_error() expects parameter 1 to be resource, boolean given in /home/bestrent/public_html/system/database/mysql.php on line 49

Warning: mysql_errno() expects parameter 1 to be resource, boolean given in /home/bestrent/public_html/system/database/mysql.php on line 49

Notice: Error:
Error No:
SELECT * FROM setting WHERE store_id = '0' in /home/bestrent/public_html/system/database/mysql.php on line 49

Warning: mysql_close() expects parameter 1 to be resource, boolean given in /home/bestrent/public_html/system/database/mysql.php on line 67