countdown displayed in a button

dotimes.js

function dotimes(amount) {
  $('button#continue_shopping_button').html("Continue Shopping (" + amount + ")");
  if (amount == 0 ) {
    $('button#continue_shopping_button').trigger('click');
    return;
  } else {
    amount = amount - 1;
    setTimeout("dotimes(" + amount + ")", 1000);
  }
  
}