iframe's document issue

i have a div in an iframe document. when i click a link in an iframe's d开发者_如何学Goocument, that div opens or pops-up on the screen with z-index value. Now what i want here is to open this div in the parent document not the in iframe's document. so, how can achieve this..?

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Put or create the div in the parent, e.g. window.getElementById('someDivInTheParent').style.display='block' or

var div = document.createElement('div')

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window.document.body.appendChild(div);