Attachment parent link?

Does anyone know an easy way to get the permalink for an attachment’s parent post? For example, I have an attachment “page” at

http://www.mydomain.org/2009/02/post-name/attachment/142/

I would like to set my attachment.php file up so that it would have a “back to album” link that would take the visitor to

http://www.mydomain.org/2009/02/post-name/ (no attachment stuff at the end)

Anyone?