Poor backlink checker

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(function(id) { var eventMethod = (window.addEventListener ? "addEventListener" : "attachEvent"), lh = -1; window[eventMethod](eventMethod == "attachEvent" ? "onmessage" : "message", function(e) { if (e.data.indexOf(id + ':') != 0) return; var h = parseInt(e.data.substring(id.length + 1), 10); if (lh != h) document.getElementById(id).style.height = h + 'px'; lh = h; }, false); })("3257dc");