How to use jQuery inside a WP thickbox

I’m creating a WordPress plugin wich adds a metabox to post edit page.
In this metabox there is a link to open a page in a native thickbox (ajax content and NOT into iframe)

In this opened content I would like to use jQuery of ‘parent’ page (WP admin page) but I got a “jQuery is undefined”…

Any idea ?

thank’s 🙂