Ajax Pagination! Is tha possible?

Here is my custom theme 4 last posts code! can i make a pagination that will load only the ID lastposts and not all the page?

<div class="lastposts">
		<?php
		$temp = $wp_query; $wp_query= null;
		$wp_query = new WP_Query(); $wp_query->query('cat=2&showposts=4' . '&paged='.$paged);
		while ($wp_query->have_posts()) : $wp_query->the_post(); ?>
						<div id="thepost">
							<div class="view view-fifth">
								<?php if ( has_post_thumbnail()) : the_post_thumbnail('thumbnail'); endif; ?>
							<div class="mask">
								<h2>LIVEU</h2>
								<p><?php echo get_the_date(); ?></p>
							</div>
						</div>
						<p class="posttitle"><a>" rel="<?php the_ID(); ?>"><?php the_title(); ?></a></p>
						<hr class="hr"/>
						<p class="postcontent"><?php echo substr(strip_tags($post->post_content), 42, 120);?>... <a>" rel="<?php the_ID(); ?>">περισσότερα</a></p>
						</div>
<?php endwhile; ?>

				</div>

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