IE 7 not displaying header image in WP 2.7

https://thecoachapproach.net.previewdns.com/
is not displaying images in header (and body?) in IE 7.
Works fine in IE 6, Firefox, Safari, etc.
Any suggestions would be appreciated!
Here is what I think might be the relevant CSS:

(The header image is 850px x 170px.)

* {
padding: 0px;
margin: 0px;
}
body { color: #666666; font-size: 9pt; font-family: Arial, Helvetica, sans-serif; line-height: 20px; background: #91adac repeat-x }
#wrap { text-align: left; width: 855px }
#navigation {
margin: 10px 0px 0px 10px;
padding: 10px 0px 5px 0px;
font-size: 11pt;
font-weight: bold;
float: left;
}
/*#topright {
float: right;
margin: 20px 10px 0px 0px;
}*/
#header {
background:url(https://thecoachapproach.net.previewdns.com/wp-content/themes/your-existence/images/background_title.jpg) no-repeat bottom center;
}
#title {
background: url(https://thecoachapproach.net.previewdns.com/wp-content/themes/your-existence/images/background_title.jpg) no-repeat;
height: 170px;
padding-left: 25px;
clear: both;
}
#main { background: url(https://thecoachapproach.net.previewdns.com/wp-content/themes/your-existence/images/background_main.gif) repeat-y; padding: 10px 10px 1500px }
#sidebar { color: #666666; margin: 0 10px 15px; padding: 10px; width: 200px; min-height: 500px; float: right }
#content { font-family: georgia, ‘Georgia Ref’, ‘Times New Roman’, serif; color: #666666; margin: 0 240px 15px 30px; padding: 10px }
#footer {