Get ID from "Page link to"

I create a new gallery template, inside my theme folder is the folder /nggallery/gallery-slide.php, here I create a link for the images using the ID of the “Page link to”
<a href="<?php bloginfo('url'); ?>/?p=<?php echo $gallery->pageid ?>"> it works, but is not exaclty what I need.

If you want all images link to the “Page link to”, but in my case is not. I use NGG Custom Fields Plugin, resolving the link and gallery like this:

<?php if (!defined ('ABSPATH')) die ('No direct access allowed'); ?><?php if (!empty ($gallery)) : ?>
	<div id="hotel-slider">
	<?php foreach ( $images as $image ) : ?>
		<div data-caption="#htmlCaption-<?php echo $image->pid ?>">
			<a href="<?php echo $image->ngg_custom_fields["Link"]; ?>">
				<img title="<?php echo $image->alttext ?>" alt="<?php echo $image->alttext ?>" src="<?php echo $image->imageURL ?>" />
			</a>
		</div>
 	<?php endforeach; ?>
	</div>
	<?php foreach ( $images as $image ) : ?>
		<div class="orbit-caption" id="htmlCaption-<?php echo $image->pid ?>">
			<?php echo $image->alttext ?>
		</div>
 	<?php endforeach; ?>
<?php endif; ?>

and I insert the gallery using the shortcode inside the theme code:

<?php if ( get_post_meta( get_the_ID(), '_ola_hotel_gallery', true) ): ?>
		<?php echo do_shortcode('[nggallery id='.get_post_meta( get_the_ID(), '_ola_hotel_gallery',true ).' template=slide]');?>
<?php endif; ?>

My PHP/MySQL skills are limited so I don´t know how to use <?php echo $gallery->pageid ?> outside the new NGG template file.