function tabSwitch(span) {
	var td = span.parentNode;
	var tr = td.parentNode;
	for (var i = 0; i < tr.childNodes.length; i++) {
		if (tr.childNodes[i].nodeType == 1) {
			var label = tr.childNodes[i];
			var layer = document.getElementById("tab-switch-layer" + label.id.replace("tab-switch-label", ""));
			label.className = label.className.replace(/\s?tab-switch-label-active/, "");
			layer.className = layer.className.replace(/\s?tab-switch-layer-active/, "");
			if (label == td) {
				label.className += " tab-switch-label-active";
				layer.className += " tab-switch-layer-active";
			}
		}
	}
}