[Phssthpok]

I'll probably be told off for asking another formatting question here... but here goes anyway.

Is there a way to float a block element in a reflowable book (e.g. a table, or a div containing an image and caption) so that it will be displayed at the top (or bottom) of a page, and so that text will be flowed around it to avoid having a huge blank area on the page before?