title: Bigcommerce Template: How to dynamically control 'Quantity' per item?
body: <p>I am modifying a Bigcommerce template. The requirement is to modify the selected value in Quantity dropdown based on other inputs by users. (I have achieved that in jsfiddle (<a href="http://jsfiddle.net/xuC6f/14/" rel="nofollow">http://jsfiddle.net/xuC6f/14/</a>)). 
  Question is: How do I, in bigcommerce template, control Quantity? i.e., </p>
  
  <pre><code>$("#qty_").val(keyTechPercentage);    
  </code></pre>
  
  <p>When I check the Source Code, it seems there's an ITEM_ID that's attached to QTY_ that makes it look like </p>
  
  <pre><code>&lt;select id="qty_53df2e8f36bb9" ...&gt;
  </code></pre>
  
  <p>Thanks a lot in advance!</p>