function closeSubMenu() {
	layerarray = new Array("sub000", "sub100", "sub200", "sub300", "sub400", "sub500", "sub600");
	for(var i=0;i<layerarray.length;i++) {
		document.getElementById(layerarray[i]).style.display = "none";
	}
}

function changeSubMenu() {
	closeSubMenu();
	var arg1 = arguments[0];
	if(arg1!=null) {
		document.getElementById(arg1).style.display = "block";
	}
}