logo.gif problems

[trappersam]

Hi
I am working with mistik on version1.3.8a. I have removed the mistik logo and added the site name directly on to the header. I am left with the little box with a red cross in it. It only shows on IE and not on FF.
I have searched the posts and tried the following;
<!-- <div id="logo">
<?php // echo '<a href="' . HTTP_SERVER . DIR_WS_CATALOG . '">' . zen_image($template->get_template_dir(HEADER_LOGO_IMAGE, DIR_WS_TEMPLATE, $current_page_base,'images'). '/' . HEADER_LOGO_IMAGE, HEADER_ALT_TEXT) . '</a>'; ?>
</div> -->
and nothing happens
Please help as i think i have tried everything, but obviously havent.
This is my third site but i have not had this problem before.
www.pawsnhoovesuk.com is the one giving me trouble

Thanks
Trappersam