title: jquery/javascript conflict error, trouble with jquery old version
body: <p>I need to hide an element when radio button changes, right now its working fine with ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js version, but many other things like slider, checkout, shipping method are disturbed when I include this jquery in my opencart website.
  any suggestion of how I can do that with simple javascript or any other method?</p>
  
  <pre><code>&lt;script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js" &gt;&lt;/script&gt;
      &lt;script type="text/javascript"&gt;
          $(document).ready(function() {
           $('input:radio[name=custom_field[6]]').change(function() {
              if (this.value == '2') {
                  $('input:radio[name=payment_method][value=cod]').show();
                  $('div.checkout-payment-methods div.radio:nth-child(5)').show();
                   }
                  else if (this.value == '1') {
                  $('input:radio[name=payment_method][value=cod]').hide();
                  $('div.checkout-payment-methods div.radio:nth-child(5)').hide();
                  }
              });
           });
      &lt;/script&gt;
  
  &lt;div id="input-payment-custom-field6"&gt;
      &lt;div class="radio"&gt;
          &lt;label&gt;
              &lt;input type="radio" name="custom_field[6]" value="2"&gt;
              Evidence
          &lt;/label&gt;
      &lt;/div&gt;
      &lt;div class="radio"&gt;
          &lt;label&gt;
              &lt;input type="radio" name="custom_field[6]" value="1"&gt;
              Invoice (Can not issue invoice with cash on delivery)
          &lt;/label&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  
  
  &lt;div class="checkout-content checkout-payment-methods"&gt;
      &lt;h2 class="secondary-title"&gt;Means of payment&lt;/h2&gt;
      &lt;div class="radio"&gt;
          &lt;label&gt;
              &lt;input type="radio" name="payment_method" value="hellaspay" checked="checked"&gt;
              Debit / Credit card
          &lt;/label&gt;
      &lt;/div&gt;
      &lt;div class="radio"&gt;
          &lt;label&gt;
              &lt;input type="radio" name="payment_method" value="bank_transfer"&gt;
              Bank deposit                           
          &lt;/label&gt;
      &lt;/div&gt;
      &lt;div class="radio"&gt;
          &lt;label&gt;
              &lt;input type="radio" name="payment_method" value="pp_standard"&gt;
              PayPal                            
          &lt;/label&gt;
      &lt;/div&gt;
      &lt;div class="radio"&gt;
          &lt;label&gt;
              &lt;input type="radio" name="payment_method" value="cod"&gt;
              Pay on delivery                            
          &lt;/label&gt;
      &lt;/div&gt;
      &lt;div class="radio"&gt;
          &lt;label&gt;
              &lt;input type="radio" name="payment_method" value="pay_at_store"&gt;
              Payment at Stark                           
          &lt;/label&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>