='comment'>// ***************************************************************</span><br>
                  <br>
                  <span id='comment'>// variable for the "next hook", which we then call in the callback function</span><br>
                  <span id='comment'>// it must have *exactly* the same parameters and calling convention as the</span><br>
                  <span id='comment'>// original function</span><br>
                  <span id='comment'>// besides, it's also the parameter that you 