title: hasClass not rendering in IE
body: <p>I'm using the Marketpress plugin in Wordpress that has been customized to allow multiple items to be added to the cart with a single click. My problem is on this <a href="http://simplygreatresumes.minnebyte.com/job-seekers-add-on-services/" rel="nofollow">page</a></p>
  
  <p>The 'add to cart' button displays in Chrome just fine, but fails to display in IE. I believe the problem is in this area </p>
  
  <pre><code>if($(".mp_button_addcart").length){
      if($('body').hasClass('page-id-1563') || $('body').hasClass('page-id-391')){
          console.log('show');
          $('.page-bkp-frame').last().append('&lt;input style="display:block" class="total_adddcart" type="button" name="addcart" value="Add To Cart &gt;&gt;" onclick="javascript:addcart_all();" &gt;');
      }else{
          $('.mp_button_addcart').show();
          $('.chk-addcart').remove();
          $('.mp_buy_form').attr('style', '');
      }
  }
  </code></pre>
  
  <p>Any help is greatly appreciated.</p>