Insert Into External Database

I am trying to move data in one table to a table in an external database and Access isn't playing ball. Supposedly you can use the 'IN' clause to link to an external database but if I put it in then I get 'Syntax error in INSERT INTO statement' and if I take it out it works fine not that, that is what I want. It's syntax seems to be defined like below at the MS website - jet reference???

I've also got a parameter that I'm trying to feed it, that is the path to the database, which is correct! c:helpcontent.mdb

Here's the query
INSERT INTO CONTENT_CLASSES IN '"+ @DBDir +"' ( PARENT_ID, CLASS_NAME, STATUS_ID, KEYWORDS, PRIORITY, LAST_CHANGED_BY, LAST_CHANGED_DATE, MULTIPLE_CONTENT )
SELECT A.PARENT_ID, A.CLASS_NAME, A.STATUS_ID, A.KEYWORDS, A.PRIORITY, A.LAST_CHANGED_BY, A.LAST_CHANGED_DATE, A.MULTIPLE_CONTENT
FROM CONTENT_CLASSES AS A;