query blog post from a cat with pagination

<?php
					  $temp = $wp_query;
					  $wp_query = null;
					  $wp_query = new WP_Query();
					  $wp_query->query('showposts=-1&cat=18'.'&paged='.$paged);

					  while ($wp_query->have_posts()) : $wp_query->the_post();
					?>
			<!-- LOOP: Usual Post Template Stuff Here-->
				<li class="sing_pomo">
					<div class="pomo_img"><a href="#"><?php the_post_thumbnail();?></a></div>
					<div class="pomo_text"><p><a href=""><?php echo excerpt(10); ?></a></p></div>
				</li>
			<!-- LOOP: Usual Post Template Stuff Here-->
			<?php endwhile; ?>

			<?php
			$wp_query = null;
			$wp_query = $temp;  // Reset
			?>

			<div class="nav-previous"><?php next_posts_link( __( '<span class="meta-nav">&larr;</span> Older posts') ); ?></div><div class="nav-next"><?php previous_posts_link( __( 'Newer posts <span class="meta-nav">&rarr;</span>') ); ?></div>


			<!-- post query from a category id-->