function clickMenu(menu) {
	rootOBJDisplay = document.getElementsByTagName("div")[menu].style.display;
	if (rootOBJDisplay == 'block') rootOBJDisplay="none";
	else if (rootOBJDisplay=="" || rootOBJDisplay=="none") rootOBJDisplay='block';
	document.getElementsByTagName("div")[menu].style.display = rootOBJDisplay;
	
}