style odd and even posts

Hi there,

Me again with another little issue.

I am calling posts from a specific category in my custom theme. This all works fab.

Just one thing I wanted to do is to add a class of odd and even to every other post called. So add an extra class of odd or even to the contentcontainer div.

Here is my code:-

<div class="maincontent">
    	<h1 class="subpageheader">
			<?php
              global $wp_query;
              $postid = $wp_query->post->ID;
              echo get_post_meta($postid, 'heading', true);
            ?>
        </h1>
		<div class="contentcontainer removegap">
			<?php if (have_posts()) : while (have_posts()) : the_post();?>
            <p><?php the_content(); ?></p>
            <?php endwhile; endif; ?>
            <h2>Q&A</h2>
            <?php
			$args = array
			(
				'numberposts'	=> 5,
				'category'		=> 4
			);
			$posts = get_posts($args);
			if (count($posts) > 0)
			{
				foreach ($posts as $post)
				{
					setup_postdata($post);
			?>
            <div class="questions">
            	<div class="questbox">
                	<p><?php the_title(); ?></p>
                </div>
            	<span class="answer"><?php echo get_the_content(); ?></span>
            </div>
            <?php
				}
			}
			?>
        </div>
    </div>