function updateIframe(headline_url, treemap_url) {
	//top.frames['gal_headline'].location.href = "demos/worldpop_headline.html";
	//top.frames['gal_treemap'].location.href = "demos/worldpop.html";	

	var isIE = navigator.appName.indexOf("Microsoft") != -1;
	// Fix for IE 6 locking up
	if (isIE) {
		top.frames['gal_headline'].location.href = "demos/blank.html";
		top.frames['gal_treemap'].location.href = "demos/blank.html";	
	}

	top.frames['gal_headline'].location.href = headline_url;
	top.frames['gal_treemap'].location.href = treemap_url;	
}