[jQuery] toggle and checkbox

[sheetzam]

Using jquery 1.2.1 toggle:

jQuery().ready(function(){
$('#multiple').toggle(
        function(){
                $('.afield').attr('disabled',true);
                },
        function(){
                $('.afield').removeAttr('disabled');
                }
        );
});

I'm trying to toggle the disabled attribute of some text input boxes
based on a checkbox input:

<form>
 <input id="multiple" type="checkbox">The Toggle</input>
 <input type="text" class="afield">
</form>

However, when the checkbox is clicked, the check does not appear.
Fails in IE and Firefox.

I've tried adding code to check the box, but that fails as well.
jQuery().ready(function(){
$('#multiple').toggle(
        function(){
                $('#multiple').attr('checked',true);
                $('.afield').attr('disabled',true);
                },
        function(){
                $('#same').removeAttr('checked');
                $('.afield').removeAttr('disabled');
                }
        );
});

What's the best way to accomplish disabling text inputs with a
checkbox?  Am I overthinking this?

Any help would sure be appreciated.