การ Get Index Of Element ด้วย Jquery

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Jquery Get Index Of Element

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>
</title>
<script src="jquery-1.8.3.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function () {
	$('.c_book').live('click',function(){
		var ind = $('.c_book').index(this);
		var val = $('.c_book').eq(ind).val();
		alert('index = '+ind+' , value = '+val);
	});
});
</script>
</head>
<body>
<div>
checkbox1 :: <input name="cb" class="c_book" type="checkbox" value="v1">
checkbox2 :: <input name="cb" class="c_book" type="checkbox" value="v2">
checkbox3 :: <input name="cb" class="c_book" type="checkbox" value="v3">
checkbox4 :: <input name="cb" class="c_book" type="checkbox" value="v4">
checkbox5 :: <input name="cb" class="c_book" type="checkbox" value="v5">
<div>
</body>
</html>