IE vs Firefox Mischief – Please Help!

I admit it, I was desiging and positioning with Firefox and didn’t think to check out IE until this morning. DOH!
Check it out: http://www.northernpassages.com/blog/index.php
As you can see, the background doesn’t quite match up to the main content section with IE, though it does with FF.
Here’s my CSS:
body {
padding: 0;
margin: 0;
background: url(background.gif) repeat-x;
font-family: “Lucida Grande”, Geneva, Arial, sans-serif;
}
#page {
background-color: #dce1e5;
margin-top: 0px;
margin-right: auto;
margin-left: auto;
padding: 0;
width: 760px;
border-left: 1px solid #a3b1be;
border-right: 1px solid #a3b1be;
}
#header {
padding: 0;
margin: 0 auto;
height: 285px;
width: 100%;
background-color: #73a0c5;
}
#headerimg {
margin: 0;
height: 285px;
width: 100%;
}
Any ideas – It’s so close to being done I can’t beleive I missed something so simple!
Thanks guys!