// tab pen style, display the selected tab
function switchpanel(idx) {
	for (i = 1; i <= 2; i ++) {
		//elmenu = document.getElementById("menu" + i);
		eldata = document.getElementById("data" + i);
		if (i == idx) {
			eldata.style.display = "block";
			//elmenu.className = "menuon";
		} else {
			eldata.style.display = "none";
			//elmenu.className = "menuoff";
		} // else
	} // for i
}