Play check boxes with jQuery

<script src="scripts/jquery-2.1.1.min.js"></script>
<script>
$(document).ready(function(){
/*
$('.c_ch_check').attr("disabled","disabled");
 $('#c_change').click(function(){
  $('.c_ch_check').removeAttr("disabled");
 });
 
 $('#e_reg').click(function(){
  $('.c_ch_check').attr("disabled","disabled");
 });
 
 $('#info').click(function(){
  $('.c_ch_check').attr("disabled","disabled");
 });
*/
/*-------------------------------------------------*/
 $('.c_ch_check').attr("disabled","disabled");
  $('input[name="up_type"]').click(function(){
   if($('#c_change').is(':checked')){
    $('.c_ch_check').removeAttr("disabled");
   }else{
    $('.c_ch_check').attr("disabled","disabled");
   }
 });
 /*-------------------------------------------------*/
 $('.c_add_text').attr("disabled","disabled");
  $('#c_add').click(function(){
   if($('#c_add').is(':checked')){
    $('.c_add_text').removeAttr("disabled");
   }else{
    $('.c_add_text').attr("disabled","disabled");
   }
  });
});
</script>

<input type="radio" name="up_type" value="c_change" id="c_change" /><label for="c_change">Course changes</label>
            <input type="checkbox" value="1" class="c_ch_check" name="c_add" id="c_add" /><label for="c_add">Add only</label>
Affected course units
                        <input type="text" name="affected_c" class="c_add_text" placeholder="Comma seperated list accepted" required/>
            <input type="checkbox" value="1" class="c_ch_check" name="c_remove" id="c_remove" /><label for="c_remove">Remove only</label>
            <input type="checkbox" value="1" class="c_ch_check" name="c_int_change" id="c_int_change" /><label for="c_int_change">Inter change</label>
<input type="radio" name="up_type" value="e_reg" id="e_reg" /><label for="e_reg">Exam registrations</label>
<input type="radio" name="up_type" value="info" id="info" /><label for="info">Information letters</label>