How to disable Featured Image Link

Hi

So this tells the featured image link whether it should open in ‘Full Post’ or just a lightbox ‘image’.

// Meta Box
	function cudazi_thumb_linksto(){
	  global $post;
	  $custom = get_post_custom($post->ID);
	  $featured_image_link_to = $custom["featured_image_link_to"][0];
	  $featured_image_link_to_url = $custom["featured_image_link_to_url"][0];
	  ?>
	  <p><?php _e('Choose on a post by post basis where the featured image thumbnails to link to.','cudazi'); ?></p>
	  <p>
	  <select name="featured_image_link_to">
	  	<option value=''><?php _e('Default','cudazi'); ?></option>
	  	<?php
	  		$featured_image_link_to_options = array(
	  			'post' => __('Full Post','cudazi'),
	  			'image' => __('Image','cudazi')
	  		);
			foreach ( $featured_image_link_to_options as $k => $v ) {
				if ( $k == $featured_image_link_to ) { $sel = " selected='selected'"; }else{ $sel = ""; }
			  	echo "<option " . $sel . " value='". $k ."'>" . $v . "</option>";
			}
	  	?>
		</select>
		<em><?php _e('or','cudazi'); ?></em> <?php _e('Custom URL:','cudazi'); ?> <input type="text" style='width:300px; border-style:solid; border-width:1px;' name="featured_image_link_to_url" value="<?php echo $featured_image_link_to_url; ?>" /> <?php _e('(Full URL - Video, External Page, etc...)','cudazi'); ?></p>
	  <?php
	}

Since I have no deep understanding of PHP, I have no idea how to comepletely turn the link off. I’d like to add an [Coming soon] option (along ‘post’ and ‘image’) so the image would be unclickable (without any ‘a href’). Maybe I could cheat and hide it with CSS, but I don’t even know how to add a class to that image/meta box/function.

Any ideas?