Custom field

Hi, I’m currently displaying a custom field within a div tag, the problem is when there’s no value within the custom field, the div tag is still displayed with no value.

Here’s my code

<div id="title"><?php $key="title"; echo get_post_meta($post->ID, $key, true); ?></div>

Is there a way to only display the div tag if there is a value within the custom field? if that makes sense

Cheers