Change 'Recent Posts'-slider to get posts from specific category

On the theme I am using – Moov – there is a slider that displays recent posts with thumbnails. An example can be found here (you’ll need to scroll down a bit).

I was hoping to change the slider to only show posts from a specific category, but I’m not sure how to go about it. I was hoping that someone could take a moment to help me out.

The code for the slider follows:

<?php
	$my_query = new WP_Query('posts_per_page=50');
		while ($my_query->have_posts()) : $my_query->the_post();
			?>
				<li>
					<a class="image" href="<?php the_permalink(); ?>" title="<?php printf( __('%s', 'moov'), the_title_attribute('echo=0') ); ?>" rel="bookmark">
					<?php if(has_post_thumbnail()) {
										echo get_the_post_thumbnail( $post->ID, 'other-post-thumbnail', array('alt'=>the_title_attribute('echo=0'),'title'=>the_title_attribute('echo=0')) );
					} else {
					echo '<img src="'.get_bloginfo("template_url").'/images/thumbnail_other.png" />';
					} ?>
					<span></span>
				</a>
			</li>
	<?php endwhile; ?>

Thanks!