function MenuOn(x){
	obj=document.getElementById("submenu"+x).style.visibility="visible";
}
function MenuOff(x){
	obj=document.getElementById("submenu"+x).style.visibility="hidden"; 
}

//プルダウン
function treeMenu(id) {
	var disp = document.all(id).style.display;
	if (disp != "none" || disp == ""){
		document.all(id).style.display = "none";
	} else {
		document.all(id).style.display = "block";
	}
}