norasp on "Internal Server Error, and Service Temporarily Unavailable"

Hello there, my client has been running a wordpress page for more than a couple of years now. Suddenly she was unable to login due to an Internal Server Error. I checked the error logs and this is what i got:

04-Nov-2011 11:39:26] PHP Fatal error: Call to undefined function mysql_select_cb() in /home/xesprodu/public_html/test.php on line 3
[04-Nov-2011 11:40:51] PHP Fatal error: Call to undefined function mysql_select_cb() in /home/xesprodu/public_html/test.php on line 3
[04-Nov-2011 11:41:02] PHP Fatal error: Call to undefined function mysql_select_cb() in /home/xesprodu/public_html/test.php on line 4
[04-Nov-2011 11:41:16] PHP Fatal error: Call to undefined function mysql_select_cb() in /home/xesprodu/public_html/test.php on line 4 [
04-Nov-2011 11:41:26] PHP Fatal error: Call to undefined function mysql_select_cb() in /home/xesprodu/public_html/test.php on line 5
[04-Nov-2011 11:41:32] PHP Fatal error: Call to undefined function mysql_select_cb() in /home/xesprodu/public_html/test.php on line 5

I tried several things, first I changed the .htpaccess name, nothing worked, then I added a php.ini file to the wp-admin server with this code memory=64MB. Lastly I changed the name of the plugins folder to deactivate it but it's still not working.

Could you please offer some help?

Thanks!