[jQuery] Hide checkbox when choosen value in select > 0

[Tan]

Hello,
<span id="thmr_5" class="thmr_call">
  <div class="form-item" id="edit-sitewide-wrapper">
 <label class="option" for="edit-sitewide"><input type="checkbox"
name="sitewide" id="edit-sitewide" value="1"   class="form-checkbox" /
> site wide</label>
</div>
</span>

<span id="thmr_7" class="thmr_call">

  <div class="form-item" id="edit-termwide-wrapper">
 <label for="edit-termwide">Choosen get termwide: </label>
 <select name="termwide" class="form-select" id="edit-termwide"
><option value="0" selected="selected">No choosen</option><option
value="256">Term1</option><option value="257">Term2</option></select>
</div>
</span>
I have code jquery when i choosen select options value > 0 then
disable checkbox :
 $('#edit-termwide').click(function() {
   if ($("#edit-termwide option:selected").length > 0) {
     $('#edit-sidewide').attr('disabled', true);
   } else {
     $('#edit-sidewide').attr('disabled', false);
   }
  });
but it's not work
please help me!