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css - overlay div over iframe

I'm making a widget similar to the uservoice widgets, except I want the content of the page to be in an iFrame rather than the widget appear via javascript. How can I have a full page (width/height 100%) iFrame with a div fixed to the left of the browser, an example (using javascript rather than css/html) is here: http://uservoice.com/demo

I want that widget to appear natively on the page, and the content be loaded via iFrame.

Any ideas? I can't make the iFrame fill the entire page, and also have the appear on top. I've played with z-indexes to no luck. Code example:

    <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> 
<head> 

            <style>
            #widget {
                left: 0px;
                position: absolute;
                top: 50%;
                display: block;
                z-index:100001;
                width: 25px;
                }
            #content {
                z-index:1;
                }
            </style>
</head> 
<body> 
    <div id="widget"> 
    widget
    </div>


    <iframe frameborder="0" id="content" src="http://www.google.com/" width="100%" height="100%"></iframe> 
</body> 
</html>
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by (71.8m points)

If you're not loading cross domain then you could just load in using jquery ajax call http://docs.jquery.com/Ajax/load

$(document).ready(function () {
    $("#content").load("page.html");
});

and replace your iframe with

<div id="content"></div>

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