if(!is_article_unavailable_for_delivery(<%= @stock_change.stock_article.id %>)) {
  <%# would be easier to return in the opposite case, but how? %>
  
  mark_article_unavailable_for_delivery(<%= @stock_change.stock_article.id %>);
  
  (function(w) {
    $('#stock_changes tr').removeClass('success');
    
    var stock_change = $(
      '<%= j(render(:partial => 'stock_change', :locals => {:stock_change => @stock_change})) %>'
    ).addClass('success');
    
    $('#stock_changes').append(stock_change);
    updateSort('#stock_changes');
    
    var quantity = w.prompt('<%= j(t('.how_many_units', :unit => @stock_change.stock_article.unit, :name => @stock_change.stock_article.name)) %>'); <%# how to properly escape here? %>
    $('input.stock-change-quantity', stock_change).val(quantity);
  })(window);

}