opt = {
  pos: 'nw',
  adjX: -10,
  adjY: -10,
  fade: 250
};
src = <pre style="background:#888;color:#fff;margin:0;width:200px;height:50px;opacity:0.8;">abc</pre>
el.innerHTML = src;
util.overlay.show('', el, opt);DEMO


opt = {
  fade: 250
};
util.overlay.hide('', el, opt);DEMO




div1



div2



div3