Connection Question

I am just learning php with MySQL.

I have a database that works perfectly, however. I want to add another table to the DB, and when I try to connect, it will not do it (subfolder), no matter what I have tried to do. It says: Warning: mysql_connect() access denied.

I am trying to access it from another subfolder on the website...so for instance:

Working Folder: Employers
Non working: Employers/addjob

Is there a reason for this, or am I just not understanding?