Auto tabbing from a text field to checkbox

Auto tabbing from a text field to checkbox

Hi , I'm trying to do autotab from a textfield to a checkbox . but it is not working . Here is my code . please help me .


<html>
<head>
<title>Check Box</title>


<script language="javascript" src="jquery.min.js" type="text/javascript"></script>
<script language="javascript" scr="jquery.autotab.js" type="text/javascript"></script>

<script type="text/javascript">

$(document).ready(function(){
    $('#gradYearFrom').autotab({ target: 'gradYearTo', format: 'numeric' });
    $('#gradYearTo').autotab({format: 'numeric', previous: 'gradYearFrom' });
    $('#gradYearTo').autotab({ target: 'checkbox1', format: 'all' });
  });


</script
</head>

<body>
   <b>Mutually Exclusive Checkbox example</b>
<form name="myform">
gradYearFrom<input id="gradYearFrom" name="gradYearFrom" size ="4" maxlength="4"></br>
gradYearTo<input id="gradYearTo" name="gradYearTo" size ="4" maxlength="4"></br>
IncludeZip<input type="checkbox" id="checkbox1" class="zip" name="checkbox1" ></br>
ExcludeZip<input type="checkbox" id="checkbox2" class="zip" name="checkbox2" ></br>
Not exclusive<input type="checkbox" id="checkbox3" name="checkbox3" ></br>

</form>
</body>
</html>