<script type="text/javascript">

    function change_value(val){

      alert ("<%= @alert %>")
      }
    }
</script>

<script type="text/javascript">

    function change_value(element){
      <% @element_id = *** element.id *** %>

      alert ("<%= @element_id %>")
      }
    }
</script>

<script type="text/javascript">

  function change_value(product){

    <% @billeable_qts[****product.id****] = ***document.getElementById('product.id').value****  %>
    <% @billeable_qts.each do |key, value| %>
       <% alert = "Key = " + key + ", value: " + value.to_s%>
       alert ("product: <%= alert %>")
    <% end %>


  }

</script>