​x
 
<html>
<head>
​
<script type="text/javascript">
function getEventTrigger(event)
  { 
  x=event.target; 
  alert("The id of the triggered element: " + x.id);
  }
</script>
</head>
​
<body >
​
<p id="p1" onmousedown="getEventTrigger(event)">
Click on this paragraph. An alert box will show which element triggered the event.</p>
​
</body>
</html>
​