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Paste the following code, within the loop, where you want to post image to be displayed.

<?php
	if (  (function_exists('has_post_image')) && (has_post_image())  ) {
		the_post_image('thumbnail');
	} else {
		$postimageurl = get_post_meta($post->ID, 'post-image', true);
		if ($postimageurl) {
			echo '<img src="'.$postimageurl.'" alt="" />';
		}
	}
?>

What this code do :
-First, it makes sure that the has_post_image() function exists and that the current post have an image attached. If both conditions are true, the post image is displayed using WordPress 2.9 function the_post_image().
-If not, the get_post_meta() function is used to get the value of the custom field which contain the post image.