iframe page template

I am trying to make a page template for easy implementation of iframes
using a custom field from the page. the custom field is called framesrc, and contains the destination URI for the iframe. My code is messy, so I can’t get it to work. Can somebody help?

<?php
/*
Template Name: framepage
*/
?>
<?php get_header(); ?>
<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
<?php the_content(); ?>
<iframe src="<?php get_post_meta(the_post, framesrc, true); ?>" class="framepost">
</iframe>

<?php endwhile; endif; ?>

<?php get_footer(); ?>