You can float both iframes and whatever you want on top of the container.
Then on the elements you want on top, just set the negative top margin.
Here's jsfiddle to show what I mean.
You can also use absolute positioning on elements that you want to see in front, but usually this leads to other problems with the site.
Update
You seem to be trying to go against a regular HTML stream. Things that appear first in HTML are usually โunderโ or before what happens after.
However, you can take an element from a regular HTML rendering stream and place it absolutely.
I updated jsfiddle to show how this is done. Be careful, the absolute position may lead to other problems in your site design.
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