Too many DELETE statements

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I have 160,000+ members in my site. 40,000 of them have not logged in since
2003 and they should be deleted. A member is not deleted from only one
table. Based on user id, he should be deleted from 5 tables and also his
photo, if any, should be unlink(ed).

I tried to do that 10 by 10 using:

$query = "delete from table1 where userid = " . $ID;
$result = mysql_query($query, $link);

$query = "delete from table2 where userid = " . $ID;
$result = mysql_query($query, $link);

...

But even with only 10 members, the page takes 30-60 seconds to come back to
me. What is the best way to accomplish this? And it is possibe to delete
1000 by 1000 or 100 by 100?

Thanks.

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