open external link within a defined pop up window

Perfect.
Now, look for the last two lines (539 and 539), They should look like this:

}
endif;

Right under that, paste the PHP code I gave you. You can leave a line between the endif and the first line of my code, for clarity:

}
endif;

/* code here */

After you paste the code, do another pastebin of functions.php so I can make sure it’s well placed.

Ok, my code is good but you have two errors in lines 350 and 353. It seems some extra line breaks got inserted by accident. To fix them, replace these lines:

<div class="comment-meta commentmetadata"><a href="<?php echo esc_url( get_comment_link( $comment-

>comment_ID ) ); ?>">
			<?php
				/* translators: 1: date, 2: time */
				printf( __( '%1$s at %2$s', 'twentyten' ), get_comment_date(),  get_comment_time() ); ?

></a><?php edit_comment_link( __( '(Edit)', 'twentyten' ), ' ' );
			?>

with these:

<div class="comment-meta commentmetadata"><a href="<?php echo esc_url( get_comment_link( $comment->comment_ID ) ); ?>">
			<?php
				/* translators: 1: date, 2: time */
				printf( __( '%1$s at %2$s', 'twentyten' ), get_comment_date(),  get_comment_time() ); ?></a><?php edit_comment_link( __( '(Edit)', 'twentyten' ), ' ' );
			?>

Well, the good news is that the script is now being inserted in your page. The bad news is that it’s not working, which is weird because it worked on my test site. Try this code instead:

function lidget_popup_link() {
?>
<script type="text/javascript">
	jQuery(window).load(function() {
		var width = "680", /* Enter popup window width here */
			height = "480", /* Enter popup window height here */
			menuItem = "menu-item-47", /* Enter menu item ID */
			target = "#"+menuItem+" a",
			hrefVal = jQuery(target).attr("href")
		;
		jQuery(target).attr({
			"href" : "#",
			"onclick" : "window.open('"+hrefVal+"','','width="+width+",height="+height+",scrollbars=no,resizable=no,location=no,menubar=no,toolbar=no')"
		});
	});
</script>
<?php
}
add_action('wp_head', 'lidget_popup_link');
?>

I forgot to replace the menu-item number when I repasted the code. Just fixed it.

Edit: I just realized your site is not loading jQuery (smacks himself in the head with a huge bat). This should do the trick for sure.

function lidget_popup_link() {
?>
<script type="text/javascript">
	jQuery(window).load(function() {
		var width = "680", /* Enter popup window width here */
			height = "480", /* Enter popup window height here */
			menuItem = "menu-item-783", /* Enter menu item ID */
			target = "#"+menuItem+" a",
			hrefVal = jQuery(target).attr("href")
		;
		jQuery(target).attr({
			"href" : "#",
			"onclick" : "window.open('"+hrefVal+"','','width="+width+",height="+height+",scrollbars=no,resizable=no,location=no,menubar=no,toolbar=no')"
		});
	});
</script>
<?php
}
add_action('wp_head', 'lidget_popup_link');

function lidget_call_jquery() {
	wp_enqueue_script('jquery');
}
add_action('wp_enqueue_scripts', 'lidget_call_jquery');
?>

See my edit above. Sorry I missed that! 😉