function writeMailAddress()
{
	var name = 'tabe';
	var domain = 'fixedpoint.jp';
	var sign = document.getElementById('signature');
	if (sign) {
		var c = sign.childNodes[0];
		var t = c.cloneNode(false);
		var a = document.createElement('a');
		sign.replaceChild(a, c);
		a.setAttribute('href', 'mailto:' + name + '@' + domain);
		a.insertBefore(t, null);
	}
}