If you use jqueryui (or another toolset) this is the way you do it
http://codepen.io/anon/pen/jeLhJ
html
<div id="hw" title="Empty the recycle bin?">The new way</div>
javascript
$('#hw').dialog({
close:function(){
alert('the old way')
}
})
UPDATE : how to include jqueryui by pointing to cdn
<link rel="stylesheet" type="text/css" href="http://code.jquery.com/ui/1.10.0/themes/base/jquery-ui.css">
<script src="http://code.jquery.com/jquery-1.9.0.js"></script>
<script src="http://code.jquery.com/ui/1.10.0/jquery-ui.js"></script>