function setTab(tabName){
	document.getElementById("tabLatest").className = "";
	document.getElementById("tabRated").className = "";
	document.getElementById("tabHeadlines").className = "";
	document.getElementById("tabFeatured").className = "";
	document.getElementById('layerLatest').style.display = 'none';
	document.getElementById('layerRated').style.display = 'none';
	document.getElementById('layerHeadlines').style.display = 'none';
	document.getElementById('layerFeatured').style.display = 'none';
	
	document.getElementById("tab"+tabName).className = "selected";
	document.getElementById('layer'+tabName).style.display = 'block';
}