Thumbnail

<?php if( get_post_meta($post->ID, "Thumbnail", true) ): ?>

				    <a href="<?php the_permalink() ?>" rel="bookmark"><img style="float:left;margin:0px 10px 0px 0px;height="150" width="150;" src="<?php echo get_post_meta($post->ID, "Thumbnail", true); ?>" alt="<?php the_title(); ?>" /></a>

				<?php else: ?>

				   	<a href="<?php the_permalink() ?>" rel="bookmark"><img style="float:left;margin:0px 10px 0px 0px;"  src="<?php bloginfo('template_url'); ?>/images/thumbnail.png" alt="<?php the_title(); ?>" /></a>

				<?php endif; ?>