function showTopLayer(nodeid, topmargin) {
	if(document.getElementById('topLayer')) hideTopLayer();
	if(document.getElementById(nodeid)) {
		topLayer = document.createElement('div');
		topLayer.id='topLayer';
		if(topmargin) topLayer.style.top = topmargin+'px';
		topLayer.innerHTML = '<a class="closelabel" onclick="hideTopLayer()">X</a>';
		topLayer.innerHTML += document.getElementById(nodeid).innerHTML;
		document.getElementById('contentContainer').appendChild(topLayer);
	}
}
function hideTopLayer() {
	document.getElementById('contentContainer').removeChild(topLayer);
}