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<input type="radio" class="aa" name="a" id="aa" value="1"/>AAA
<input type="radio" class="aa" name="a" id="aa" value="2"/>BBB
<input type="radio" class="bb" name="b" id="bb" value="1"/>CCC
<input type="radio" class="bb" name="b" id="bb" value="2"/>DDD
document.getElementsByName("name")[1].value=document.getElementsByName("name")[0].value
document.getElementsByName("mj")[1].value=document.getElementsByName("mj")[0].value
<div id="box">
<input type="radio" class="aa" name="a" id="aa" value="1"/>AAA
<input type="radio" class="aa" name="a" id="aa" value="2"/>BBB
<input type="radio" class="bb" name="b" id="bb" value="1"/>CCC
<input type="radio" class="bb" name="b" id="bb" value="2"/>DDD
</div>
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript">
$("#box").on("click", "input[type=radio]", function(event){
$("#box input[type=radio][value="+this.value+"]").prop("checked",true);
});
</script>