Jquery.check..box

When Check the box I want to add 50 to textbox value. and when I Uncheck it should deduct 50 from the textbox value...should..use..jquery..each..function..since...the..check..box..and..text.box..[login to view URL] <label class="checkbox-inline"> <input type="checkbox" class="square-red" id="Pic" > Photo </label> <input type="text" value="3000"> <script> jQuery(document).ready(function() { $('#Pic').click(function() { if (!$(this).is(':checked')) { } }); }); </script>