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Подскажите как в Яве скрипте сделать проверку цены на 0

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Подскажите пожалуйста,

в шаблоне есть замечательный код  - уведомить о наличии.

Как его можно поправить, что если цена стоит 0, чтобы он вызывался?  

Те как я понел, мне нужна проверка на цену 0

  <script type="text/javascript">
  $(document).ready(function() {uni_notify();});
  $(document).ajaxStop(function() {uni_notify();});
  function uni_notify() {
  $('.add_to_cart.disabled').each(function() {
  var p_id = $(this).attr('class').replace(/\s+/g, '').match(/(\d+)/g);
  $(this).unbind('click').attr('onclick', 'callback("Уведомить о наличии", '+p_id+');').removeAttr('disabled');

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<?php if($price == 0) { ?>
  	<script type="text/javascript">
		$(document).ready(function() {uni_notify();});
<?php } ?>


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