How Do I fix this

[Sho'man]

Ever Since I signed up here, I can't get on the other site. I haven't done anything different to my PC. I need IT help! Here's the message I get & don't know how to fix it. Thankful for any assistance.

Warning: mysql_real_escape_string() [function.mysql-real-escape-string]: Access denied for user 'nobody'@'localhost' (using password: NO) in /www/tidalfish.com/subdreamer/SDCMS_Pro_240/upload/includes/globalfunctions.php on line 799

Warning: mysql_real_escape_string() [function.mysql-real-escape-string]: A link to the server could not be established in /www/tidalfish.com/subdreamer/SDCMS_Pro_240/upload/includes/globalfunctions.php on line 799

Warning: mysql_query(): supplied argument is not a valid MySQL-Link resource in /www/tidalfish.com/subdreamer/SDCMS_Pro_240/upload/includes/db/mysql.php on line 130
Database Error.