function openCredits()
{
	var finestra = document.createElement('div');
   
	finestra.style.position = 'relative';
	finestra.style.zIndex = '100';
	finestra.style.opacity = '0';
	finestra.innerHTML = '<div><div id="closeTip" onClick="javascript:closeCredits();"><img src="img/x_di_credits.png" /></div><img src="img/credits_graphic_photo.png" border="0" usemap="#Map2"/><map name="Map2" id="Map2"><area shape="rect" coords="14,40,73,57" href="http://www.direweb.it" target="_blank" /></map></div>';
	document.getElementById('tooltip').appendChild(finestra);
	JSTweener.addTween(finestra.style, {time:0.3, transition:'linear', opacity:1.0});
}


function closeCredits()
{
	var finestra = document.getElementById('tooltip').firstChild;
	JSTweener.addTween(finestra.style, {time:0.3, transition:'linear', opacity:0.0, onComplete:destroyTip});
}

function destroyTip()
{
	document.getElementById('tooltip').removeChild(document.getElementById('tooltip').firstChild);
}