how to paste a content of other document

Sorry for silly question but really I don’t know how to do it.

inside a document I would like to paste content of other document.

When I’m using Ditto call. ...[!Ditto?parents=`291` &tpl=`wyswietl_tresc`!] it doesn’t work because parent 291 has no childs.
I would like to paste directly this parent [291].

How should I do it?
Thanks for help!

use this handy snippet: http://modxcms.com/getField-667.html

thanks, it works perfectly!