I have the following code which is working, I was wondering if this can simplified more.

Demo: http://jsfiddle.net/TnpNV/8/

<form name="cbform">
<input type="checkbox" value="1" name="one" id="one" /> one<br />
<input type="checkbox" value="1" name="two" id="two" /> two
</form>?

<script>
$('#one, #two').click(function(event) {
    var checked = $(this).is(':checked');
    if (checked) {
        $('#one').attr('checked', true);
        $('#two').attr('checked', true);
    }
    else {
        $('#one').attr('checked', false);
        $('#two').attr('checked', false);
    }
});
</script>

It's basically a two checkbox that is dependent on each other. Jquery was used to check and uncheck them.

Regards