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<!DOCTYPE html>
<html>
<head>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</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; }
</style>
</head>
<body>
  <div id="SelectContainer">
  <select name="blah[]">
    <option value="A">A</option>
    <option value="B">B</option>
</select>
<select name="blah[]">
    <option value="A">A</option>
    <option value="B">B</option>
</select>
  
  <select name="blah[]">
    <option value="A">A</option>
    <option value="B">B</option>
</select>
<select name="blah[]">
    <option value="A">A</option>
    <option value="B">B</option>
</select>
    
  <select name="blah[]">
    <option value="A">A</option>
    <option value="B">B</option>
</select>
<select name="blah[]">
    <option value="A">A</option>
    <option value="B">B</option>
</select>
  </div>
</body>
</html>
 
$(function() {
    $('#SelectContainer').delegate('select', 'change', function() {
      var select = $(this),
          selectedValue = select.val(),
          otherCurrent = select[selectedValue === 'A' ? 'prevAll' : 'nextAll']('select'),
          selectedIndex = select.children(':selected').index();
    
      otherCurrent .val(selectedValue);
    });
​
});
Output

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anonymouspro
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