How do I link to an image with PHP code?

I’ve made a hover button for my feedburner RSS in my header and works fine as I have it linking directly on my URL.

I want to re-distribute my theme, so I need to reference that hover button to the URL that the theme will be used on. What code do I use to do this? Here is the hover button code, that works on my site:

<div id="headerright">

<input type="hidden" value="<?php $feedburner_id = get_option('revlifestyle_feedburner_id'); echo $feedburner_id; ?>" name="http://feeds2.feedburner.com/"/>

<a href="<?php bloginfo('rss_url'); ?>"

onmouseover="image1.src='http://www.mysite.com/wp-content/themes/mytheme/images/rss-hov-maroon.png';"
onmouseout="image1.src='http://www.mysite.com/wp-content/themes/mytheme/images/rss-maroon.png';">
<img name="image1" src="http://www.mysite.com/wp-content/themes/mytheme/images/rss-maroon.png" border=0></a> border=0></a>

	</div>