function set_tag_a(url, title){
	var eA = document.createElement('a');
	eA.href = url;
	var eSpan = document.createElement('span');
	eA.innerHTML = title;
	eA.appendChild(eSpan);
	
	 Event.observe(eA, 'click', function(e) {
			window.open(url);
			Event.stop(e);
		}.bindAsEventListener(eA));
	
	//$$('signature')[0].appendChild(eA);
	$('signature').insert(eA);
}