Problems inserting in to database

$pass = base64_encode($entries[1]);

                        $sql = "INSERT INTO project_domain_list (domain,username,password) VALUES ($entries[0], $pass, $entries[2])";
                        
                        mysql_select_db('inthzcom_intranet');
                        $retval = mysql_query( $sql, $conn );

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excerpt from my code, anyway, I'm getting this error:

Could not enter data: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' P~F!~R]?tp)' at line 1

I'm inserting passwords in to the database.  Help?