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<!DOCTYPE html>
<html>
<head>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js"></script>
<meta charset=utf-8 />
<title>Test Page</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
  body {
    font-family: sans-serif;
  }
  p {
    margin: 0px;
  }
</style>
</head>
<body>
  <form id='theForm'>
    <input type='text' name='picture-1' value="This is the test
                                               ">
    <input type='button' id='btnMore' value='+'>
  </form>
</body>
</html>
 
​
$(function(){
  
  $('#btnMore').click(function() {
    var form, fields, newField;
    
    form = $("#theForm");
    fields = form.find("input[name^='picture-']");
    newField = $(fields[0]).clone();
    newField.attr('name', 'pict-' + (fields.length + 0));
    newField.insertAfter(fields.last());
    fields.last().remove();
    
  });
  
});
​
Output

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