trList = ["treeMenu1","treeMenu2","treeMenu3","treeMenu4"]; //　ツリーメニューのリスト
function exMenu(tName)
{
for (i=0; i<trList.length; i++) {
if(tName != trList[i])document.getElementById(trList[i]).style.display = "none"; 
}
tMenu = document.getElementById(tName).style;
if (tMenu.display == 'none') tMenu.display = "block"; else tMenu.display = "none";
}