<script type="text/javascript" src="/sh/lib/jquery/jquery-1.5.2.min.js"></script>
<script>
$(document).ready(function(){
$('select[name="location"]').change(function(){
$('select[name="location"]').val($(this).val());
}).change();
});
</script>
<form>
<select name="location">
<option value="1">111</option>
<option value="2">222</option>
<option value="3">333</option>
</select>
</form>
<form>
<select name="location">
<option value="1">111</option>
<option value="2">222</option>
<option value="3">333</option>
</select>
</form>