function back2entry(url) {
	if(window.opener) {
		if(window.opener.closed)
			window.open(url, "n04entry");
		else
			window.opener.focus();
	}
	else {
		location.href = url;
	}
}

function log4e(filename) {
	var ImageWidth  =  1;
	var ImageHeight =  1;
	var ScriptUrl   = 'http://shouchan.ei.tuat.ac.jp/~rencon/cgi/log4e/log4.cgi';
	var CounterName = filename;

	var Tag = '<img' +
				' src="'   + ScriptUrl   + '?' + CounterName + '@' + document.referrer + '"' +
				' width='  + ImageWidth  +
				' height=' + ImageHeight +
	          '>';
	document.write(Tag);
}