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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
                    "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <title></title>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js"></script>
 
    <script type="text/javascript">
        $(document).ready(function() {
            var clonedInput = $('#input1').clone();
            $('#btnAdd').click(function() {
                var num     = $('.clonedInput').length; // how many "duplicatable" input fields we currently have
                var newNum  = new Number(num + 1);      // the numeric ID of the new input field being added
 
                // create the new element via clone(), and manipulate it's ID using newNum value
                var newElem = clonedInput.clone().attr('id', 'input' + newNum);
 
                // manipulate the name/id values of the input inside the new element
                newElem.children(':first').attr('id', 'name' + newNum).attr('name', 'name' + newNum);
 
                // insert the new element after the last "duplicatable" input field
                $('#input' + num).after(newElem);
 
                // enable the "remove" button
                $('#btnDel').attr('disabled','');
 
                // business rule: you can only add 5 names
                if (newNum == 5)
                    $('#btnAdd').attr('disabled','disabled');
            });
 
            $('#btnDel').click(function() {
                var num = $('.clonedInput').length; // how many "duplicatable" input fields we currently have
                $('#input' + num).remove();     // remove the last element
 
                // enable the "add" button
                $('#btnAdd').attr('disabled','');
 
                // if only one element remains, disable the "remove" button
                if (num-1 == 1)
                    $('#btnDel').attr('disabled','disabled');
            });
 
            $('#btnDel').attr('disabled','disabled');
        });
    </script>
</head>
 
<body>
 
<form id="myForm">
    <div id="input1" style="margin-bottom:4px;" class="clonedInput">
        Name: <input type="text" name="name1" id="name1" />
    </div>
 
    <div>
        <input type="button" id="btnAdd" value="add another name" />
        <input type="button" id="btnDel" value="remove name" />
    </div>
</form>
 
</body>
</html>
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