function showTopLayer(nodeid, topmargin) {
	if(document.getElementById('topLayerBG')) hideTopLayer();
	if(document.getElementById(nodeid)) {
		topLayerBG = document.createElement('div');
		topLayerBG.id='topLayerBG';
		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.getElementsByTagName('body')[0].appendChild(topLayerBG);
		document.getElementById('topLayerBG').appendChild(topLayer);
	}
}
function hideTopLayer() {
	document.getElementsByTagName('body')[0].removeChild(topLayerBG);
}