int msql_select_db(string database_name, int link_identifier);
Returns true on success, false on error.
msql_select_db() sets the current active database on the server that's associated with the specified link identifier. If no link identifier is specified, the last opened link is assumed. If no link is open, the function will try to establish a link as if msql_connect() was called, and use it.
Every subsequent call to msql_query() will be made on the active database.