iframe display specific vertical position of the content

[perhapscwk]

is there anyway can use a iframe, and when the page load,

the iframe content auto scroll to specific vertical location(such as the center of the whole page) of the
page.

[gits]

you might use the window.scrollTo() method ... the more tricky thing would be to identify the 'center' position of the content document ... are there DOM nodes that you might use to identify a position in the document?