function fold(id) {
	    if(typeof(id) == "object") {
	        for(var i in id) {
	            fe(id[i]);
	        }
	    } else {
	        fe(id);
	    }
	}
	function fe(id) {
	    var target = document.getElementById(id);
	    if(target.style.display == "none") { 
	        target.style.display = "block";
	        target.style.visibility = "visible";
	    } else {
	        target.style.display = "none";
	        target.style.visibility = "hidden";
	    }
	}
	window.onload = function() {
	    // 読み込み時に非表示にする
	    fold(["open", "a02", "a03",]);
	}