var eA = document.createElement('a');
eA.href = 'http://www.cybergeneration.com/';
var eSpan = document.createElement('span');
eA.innerHTML = 'Conception web Cyber Génération';
eA.appendChild(eSpan);

 Event.observe(eA, 'click', function(e) {
		window.open('http://www.cybergeneration.com/');
		Event.stop(e);
	}.bindAsEventListener(eA));

$$('div#signatureCyber')[0].appendChild(eA);