Add link to email to product details page. Sends SKU in the body of email and 'I want to pre-order' in the subject

pre-order.js

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script>
Ecwid.OnPageLoaded.add(function(page){
    setTimeout(function hidePrice() {
      if(page.type == "CATEGORY") {
        $(".ecwid-BuyNow-outOfStockLabel").each(function(idx, el){
                $(el).after('<br/>Click to pre-order');
      });
  }
      if (page.type == "PRODUCT") {
        var sku = $('.ecwid-productBrowser-sku').text();
        if($('div').hasClass('ecwid-productBrowser-details-outOfStockLabel') && !$('a').hasClass('pre-order')) {
            $('<a class="pre-order" href="mailto:mail@example.com?subject=I want to pre-order&body='+sku+'">Email to pre-order</a>').insertAfter('.ecwid-productBrowser-details-outOfStockLabel');
            added = true;
        }
        else if ($('div').hasClass('ecwid-productBrowser-details-inStockLabel') && $('a').hasClass('pre-order')) {
          $('.pre-order').remove();
        }
      }
}, 200);
});
</script>