Using external page properties to dynamically set width and height?

[tinyearth]

When using the "external sites and pages" player along with jQuery, is it possible to get some CSS properties of the external page to dynamically set the width and height of Shadowbox?

For example, something to the effect of this:

Shadowbox.setup($('.sb-page'), {
height: $(target page's element).height(),
width: $(target page's element).width()
});