Some parts of the site not accessible

[nifameli]

I hope this is not out of place here, I'm practically a newbie to the forum although I registered a couple of years ago.
I am having trouble accessing some parts of the forum, like for example Delica Photos and Delica Trader. Clicking on those links gets me to an error message page.

Here are the error messages I get:
Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /home/delica/public_html/Photos/include/functions.inc.php:183 Stack trace: #0 /home/delica/public_html/Photos/include/init.inc.php(171): cpg_db_connect() #1 /home/delica/public_html/Photos/index.php(26): require('/home/delica/pu...') #2 {main} thrown in /home/delica/public_html/Photos/include/functions.inc.php on line 183

ErrorException [ 2 ]: Use of undefined constant MCRYPT_MODE_NOFB - assumed 'MCRYPT_MODE_NOFB' (this will throw an Error in a future version of PHP) ~ APPPATH/config/auth.php [ 15 ]

Thanks for any assistance.