SEO-friendly internal links?

Hi,

I have just launched a new website this morning (woo!)

One quick question – I currently have links hard-coded into the template, for example:

<a href="index.php?page_id=18">
<img src="<?php bloginfo('template_url'); ?>/images/mirrors.jpg" alt="Mirrors" height="200" width="200"/>
</a>

This is built into a custom Page Template.

I have since set my Permalinks to SEF but the custom hard-coded links (above) are obviously not being rewritten (they point to the right pages but the initial link itself is not the same). Obviously for SEO purposes I want these to rewrite as well.

Is the easiest way of doing this something like:

<a href="<?php echo get_settings('home'); ?>/mirrors/">
<img src="<?php bloginfo('template_url'); ?>/images/mirrors.jpg" alt="Mirrors" height="200" width="200"/>
</a>

?? Anybody know of a better way?