If I open a dialog like so:

$('<iframe id="externalSite" class="externalSite" src="http://www.example.com" />').dialog({
        autoOpen: true,
        width: 800,
        height: 500,
        modal: true,
        resizable: true
    })

How can I close the dialog from withing the iframe?

javascript jquery jquery-ui iframe dialog
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