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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<title>Sandbox</title>
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<style type="text/css" media="screen">
body { background-color: #000; font: 16px Helvetica, Arial; color: #fff; }
</style>
</head>
<body>
  <select name="abc123" id="abc123">
    <option value="abc">abc</option>
    <option value="123">123</option>
  </select>
  
<form id="theOptions">
  <input type="radio" name="opts" value="1">1</option>
  <input type="radio" name="opts" value="2">2</option>
  <input type="radio" name="opts" value="3">3</option>
  <input type="radio" name="opts" value="a">a</option>
  <input type="radio" name="opts" value="b">b</option>
  <input type="radio" name="opts" value="c">c</option>
</select>
</body>
</html>
 
$(function() {
$("#abc123").change(function() {
   if($(this).attr('id') == 'abc123') {
      // Disable 123 and Enable abc
      $("#theOptions input[value='1']").attr("hide","hide");
      $("#theOptions input[value='2']").attr("disabled","disabled");
      $("#theOptions input[value='3']").attr("disabled","disabled");
      $("#theOptions input[value='a']").attr("selected","selected");
      $("#theOptions input[value='a']").attr("disabled","");
      $("#theOptions input[value='b']").attr("disabled","");
      $("#theOptions input[value='c']").attr("disabled","");
   } else {
      // Disable abc's and Enable 123
      $("#theOptions input[value='a']").attr("disabled","disabled");
      $("#theOptions input[value='b']").attr("disabled","disabled");
      $("#theOptions input[value='c']").attr("disabled","disabled");
      $("#theOptions input[value='1']").attr("disabled","");
      $("#theOptions input[value='1']").attr("selected","selected");
      $("#theOptions input[value='2']").attr("disabled","");
      $("#theOptions input[value='3']").attr("disabled","");
      
   }    
});
});
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