​x
 
<html>
<head>
<script type="text/javascript">
function checkTab(x)
  {
  alert(x.tabIndex)
  }
</script>
</head>
<body>
​
<form>
<input type="text" tabindex="1" onclick="checkTab(this)">
<input type="text" tabindex="2" onclick="checkTab(this)">
<input type="text" tabindex="3" onclick="checkTab(this)">
</form>
​
</body>
</html>
​