function showLayer(layerName, shadowLayerName){
	if (document.getElementById){ // Netscape 6 and IE 5+
		var targetElement = document.getElementById(layerName);
		var shadowElement = document.getElementById(shadowLayerName);
		targetElement.style.top = shadowElement.style.top;
	targetElement.style.visibility = 'visible';
	}
}


function hideLayer(layerName){
	if (document.getElementById) {
		var targetElement = document.getElementById(layerName);
		targetElement.style.visibility = 'hidden';
	}
}

function expandFirst() {
			document.getElementById(expandFirst.arguments[0]).style.display = "block";
			for (var i=1; i<expandFirst.arguments.length; i++) {
				document.getElementById(expandFirst.arguments[i]).style.display = "none";
			}
		}
function expandCollapse() {
	for (var i=0; i<expandCollapse.arguments.length; i++) {
		var element = document.getElementById(expandCollapse.arguments[i]);
		element.style.display = (element.style.display == "none") ? "block" : "none";
	}
}