What does this code mean?

What does this code mean?

<div class=”pic fl”>“><img src=”<?php echo get_post_meta($post->ID, ‘thumbnail’, true);?>” alt=”Post Pic” width=”594″ height=”236″ />

I need to retrieve photos in my blog post to display on my index page of my blog..

this code shows a broken image, when I have images in the posts..

Is there is different code i should use? (The image needs to be 594 x 236)

it will be displayed here (www.philaiellomarketing.com/blog)