Need help with an SQL Query!

[SnapOff Racing]

I need an SQL query or PHP script that will delete attachments from a certain forum. So far the only thing I can somewhat come up with is this query that I slapped together which if MySQL could understand what I was saying then it would work just fine However I must translate this into MySQL's language as obviously it doesn't work as it sits!

SELECT * FROM `thread` WHERE `forumid` = '25' AS t1
SELECT * FROM `t1`,`post` WHERE `post.postid` = `t1.postid` AS t2
SELECT * FROM `t2`,`attachment` WHERE `attachment.postid` = `t2.postid`

So in the first line I wanna select all rows from the `thread` table WHERE the column `forumid` is = to 25 and then ALIAS this as t1

The second line SELECT all rows FROM `t1` (which we just created with line 1) and all rows from `post` WHERE `post.postid` = `t1,postid` and ALIAS this as t2

The third line SELECT all rows FROM `t2` (which we just created with line 2) and also SELECT all rows from `post` WHERE `attachment.postid` = `t2.postid`

This should now give me my final list of all the attachments that are in posted in forumid 25

Hope this all makes sense. If you have a better solution which I'm sure you will then that's fine. When it comes down to it all I need to do is DELETE all the attachments that are in a particular forum. This is the somewhat only way I can think to do it.

Any ideas?