[jQuery] check uncheck

[[EMAIL PROTECTED]]

I need the check of a checkbox disable other inputs and change value
to others.
Here the code:

//click on keep prop cancel unnecesary fields
$(document).ready(function(){
        $('#keepProp').click(function(){
                state = $('.percent').val();
                if (this.checked){
                        $('.depend').attr({disabled:'true'});
                        $('.percent').val('%');
                } else {
                        $('.depend').attr({disabled:'false'});
                        $('.percent').val(state);
                };
        });
});

Works fine if I check but the uncheck operation do not do nothing???

Help

Andrea