tk

var self = this,
	renderFrame = self.document.getElementById("render_frame"),
	iFrame = self.document.getElementById('iframe_exec'),
	interval;
	
interval = setInterval(function() {
	var nodes = iFrame.contentDocument.body.cloneNode(true), frag;
	
	frag = document.createDocumentFragment();
	for (var i = 0, ch = nodes.children; e = ch.length; i != e; ++i)
		frag.appendChild(ch[i]);

	renderFrame.innerHTML = '';
	renderFrame.appendChild(frag);
}, 1000);