“Compose” link for Authors and Admin

In my sidebar “Admin” section, I’ve included a link to the backend “Write a Post” page but I’d like to make it visible only to users who can author, edit or administrate pages. What php do I need to insert in order to accomplish this? My sidebar code looks like this at present:

<h2><?php _e('Administration'); ?></h2>

<ul>
<li><?php wp_register(); ?></li>
<li><a href="../wp-admin/post.php">Compose</a></li>
<li><?php wp_loginout(); ?></li>
</ul>

Thanks