Re Positioning iframes by hide/show

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I have the current code, which hides/shows iframes (external pages rendering text columns via cgi - displayed left to right) via buttons at the top of the page. Right now the iframes are positioned using absolute, but I would like them to 'reorder' and change location depending on which are hidden vs shown. EX: if only 2 iframes are shown, they would reduce the left right space occupied. This is important, as I will be adding more content than can fit on the page at a time. (Also, I am trying to change the Jscript to hide everything by default, instead of show on page load)