DELETE based on JOIN

[Jesse]

I need to delete some records based on a JOIN relation.  The following works 
in Microsoft SQL Server, and the syntax appears to be correct for MySQL, but 
it reports "syntax..near 'DELETE FROM ConvInvDet FROM ConvInvDet H...". 
What's the proper way to format this for MySQL?

DELETE FROM ConfInvDet
FROM ConfInvDet H LEFT JOIN ConfInvoices I ON I.InvoiceNo=H.InvoiceNo
WHERE I.ID IS NULL;

Basically, I'm trying to delete orphan records.  I'm using MySQL 5.

Thanks,
Jesse