If anyone else is having this problem, I edited the plugin to get the target attribute of the link to be “_blank” when you select “Target external window” in “REL Options” select box. Here’s how:
Open up menu-creator.lib.php
Line 181:
Change this
echo '<li id="menu_item_' . $item["id"] . '" class="mc_menu_item ' . ($item["type"] == "wordpress" ? "wordpress_link" : "external_link") . ' ' . $class . '"><a href="' . resolveURL($item) . '" title="' . $item["alttext"] . '" rel="' . $item["target"] . '">' . $item["title"] . '</a>';
To this:
echo '<li id="menu_item_' . $item["id"] . '" class="mc_menu_item ' . ($item["type"] == "wordpress" ? "wordpress_link" : "external_link") . ' ' . $class . '"><a href="' . resolveURL($item) . '" title="' . $item["alttext"] . '" rel="' . $item["target"] . '"';
if($item["target"] == 'external') echo ' target="_blank"';
echo '>' . $item["title"] . '</a>';
That doesn’t solve the issue with the “REL Options” select box showing the appropriate value, but it will add the target=”_blank” attribute to any links you set to “Open in external window”.