Permalinks break pictures

Hi,
I’m hoping someone can help.
I’ve been trying to update our site to reflect better SEO standards and so this morning I changed our permalink structure from numeric to /%category%/%postname%/. I’m using custom fields to pull out an ad banner on each custom page and now they’ve disappeared. After searching around on the forum I understand that my problem is that I’m using a relative path to my images, however I’ve tried using php template tags to grab the images and I still can’t get it to work. I’ve used both:
<img src="<?php bloginfo('template_directory') ?>/style/images/warranty_banner.jpg"/>
and
<img src="<?php bloginfo('template_url'); ?>/style/images/warranty_banner.jpg"/>
With no luck.
The website is: centurionsystems.com, when you click onto any of the pages there should be a banner like on the home page but they don’t appear.
Any help is greatly appreciated.