function removeAll(form) {
  removeItems(form, true);
  form.submit();
}

function removeItems(form) {
  removeItems(form, false);
}

function removeItems(form, removeall) {
  var size = form.elements.length;
  for (i=0;i<size;i++) {
    var element = form.elements[i];
    if (element.name != '' && element.name.indexOf("deleteItem") > -1 && (element.checked || removeall)) {
      var id = element.name.substring(10)
      var amount = document.getElementById('quantity_' + id)
      amount.value = '0';
    }
  }
  return true;
}