Header shows in Safari but not in IE7

I'm unable to view the header image in IE7 (www.becomingaprayingcongregation.com) but I can view it in Firefox. Are there existing issues or is there something I need to correct.

Here's what the CSS looks like:
<?php
function bfa_rotating_header_images() {

if (file_exists(ABSPATH."/wpmu-settings.php")) {

################### images in WP upload folder (on WPMU)

$files = m_find_in_dir(url('/wp-content/themes/atahualpa/images/header/weblabryinthheaderghosted.jpg'),
'atahualpa_header_[0-9]+\.(jpe?g|png|gif|bmp)$');

if ($files) {
foreach($files as $value) {
$bfa_header_images[] = "'" . str_replace(url('/wp-content/themes/atahualpa/images/header/weblabryinthheaderghosted.jpg'),
url('/wp-content/themes/atahualpa/images/header/weblabryinthheaderghosted.jpg'), $value) . "'";
}
}

}

# If no user uploaded header image files were found in WPMU, or this is not WPMU:

if (!file_exists(ABSPATH."/wpmu-settings.php") OR !$files ) {


################### images in /images/header/ (on regular WordPress)

$files = "";
$imgpath = TEMPLATEPATH . '/images/header/';
$imgdir = get_bloginfo('template_directory') . '/images/header/';
$dh = opendir($imgpath);

while (FALSE !== ($filename = readdir($dh))) {
if(eregi('.jpg', $filename) || eregi('.gif', $filename) || eregi('.png', $filename)) {
$files[] = $filename;
}
}
closedir($dh);

foreach($files as $value) {
$bfa_header_images[] = '\'' . $imgdir . $value . '\'';
}

}


return $bfa_header_images;
}
?>