jQuery.fn.filterOptions = function(radio, values) {
    return this.each(function() {
        var select = this;
        var options = [];
        $(select).find('option').each(function() {
            options.push({value: $(this).val(), text: $(this).text()});
        });
        $(select).data('options', options);
        $(radio).click(function() {
            var options = $(select).empty().data('options');
            var haystack = values[$(this).attr('id')];
            $.each(options, function(i) {
                var option = options[i];
                if($.inArray(option.value, haystack) !== -1) {
                    $(select).append(
                    $('<option>').text(option.text).val(option.value)
                    );
                }
            });
        });            
    });
};

/*
<script type="text/javascript">
$(document).ready(function(){
    $("#theOptions").filterOn("input:radio[name=abc123]", {
        "abc": ["a","b","c"],
        "123": ["1","2","3"]        
    });
});
</script>


ABC: <input type="radio" name="abc123" id="abc"/>
123: <input type="radio" name="abc123" id="123"/>

<select id="theOptions">
  <option value="1">1</option>
  <option value="2">2</option>
  <option value="3">3</option>
  <option value="a">a</option>
  <option value="b">b</option>
  <option value="c">c</option>
</select>
*/