using jquery in iframe child to check checkboxes by name

I have an iframe (same domain) that has a bunch of checkboxes on it. I'd like to have javascript run from the parent page and mark checkboxes in the child based on the name of the checkboxes (they have different values - but I'd like to check them all). The iframe's id and its name are both AppBody. All the checkboxes I care about are named dow0.