The target property refers to the object on which the event takes place.
<html>
<head>
<title>Using the target property of the event object</title>
</head>
<body>
<script language = "JavaScript">
<!--
function whichButton(evnt){
window.captureEvents(evnt.CLICK);
alert("The button you pressed was:" + evnt.target.value);
}
-->
</script>
<form name="form1">
Choose a button and click on it.
<br><br>
<input type="button" value="Button1" name="Button1" onClick = whichButton(event)>
<input type="button" value="Button2" name="Button2" onClick = whichButton(event)>
<input type="button" value="Button3" name="Button3" onClick = whichButton(event)>
</form>
</body>
</html>