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Jquery to make field required based on other Field

<!DOCTYPE html>
<html>
<head>
<title>Try jQuery Online</title>
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script>
$(document).ready(function() {
   $("em").addClass("selected");
   $("#myid").addClass("highlight");
  
 
     $('#text1').change(function() {
            var x = document.getElementById("label2");
             
            if (x.innerHTML === "Last Name") {
                x.innerHTML = "Last Name*";
            } else {
                x.innerHTML = "Last Name";
            }

        if ($('#text2').attr('required')) {
            $('#text2').removeAttr('required');
        }
        else {
            $('#text2').attr('required','required');
        }
    });
  
});
</script>
<style>
.selected {
    color:red;
}
.highlight {
    background:yellow;
}
</style>
</head>
<body>
    <form>
        <label for="text1" id="label1"> first name</label>
<p><input type="textbox" id="text1"/> Check Me to make the Text Box a Required Field</p>
<b>
    </b>
       <label for="tex2" id="label2">Last Name</label>
<input type="text" id="text2" />
<input type="submit" value="Submit" />
</form>
</body>
</html>

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