display in IE 7

i need help desperately!

i have styled my site to 1000px width and have set the content and header margins to 'auto' so that the pages will be centered.

this is fine and works beautifully in firefox 2 + 3

most pages work fine in IE 7 also, however 3 or so pages do not center and are displayed to the left which looks disgusting! this is strange because it is only some pages in IE7, but i really want the site to be centered correctly for every page, this is killing me i cannot see where i have coded wrong as the site displays fine in firefox and most pages are fine in IE also...it makes no sense to me - please help! thanks

here is my style.css file i have modified - i worked from a bluemarine base (website - www.fullforcefitness.com.au)

/* $Id: style.css,v 1.19 2006/12/27 13:17:15 drumm Exp $ */

/*
** HTML elements
*/
body {
margin: auto;
padding: 0;
background: url('pagbg11.png') no-repeat scroll center top;
color: #000;
font: 76% Arial, Helvetica, sans-serif;
}
tr.odd td, tr.even td {
padding: 0.3em;
}
h2, h3, h4, h5, h6 {
margin-bottom: 0.5em;
}
h1 {
background-image: url('h12bg.png');
padding: 7px;
font-size: 1.1em;
color: #ffffff;
text-align: center;
margin-bottom: 0.3em;
margin-top: 0.3em;
}
h2 {
background-image: url('h12bg.png');
font-size: 1.1em;
text-align: center;
color: #ffffff;
a:link #ffffff;
margin-bottom: 0.3em;
margin-top: 0.1px;
padding: 7px 7px 7px 7px;
}

h3, h4, h5, h6 {
font-size: 1.0em;
}
p {
margin-top: 0.5em;
margin-bottom: 0.9em;
}

a {
text-decoration: none;
font-weight: bold;
}
a:link {
color: #000000;
}
a:visited {
color: #000000;
}
a:hover {
color: #CD0000;
text-decoration: underline;
}
fieldset {
border: 0px solid #000000;
}
pre {
background-color: #eee;
padding: 0.75em 1.5em;
font-size: 12px;
border: 1px solid #ddd;
}
table {
/* make

sizes relative to body size! */
font-size: 1em;
}
.form-item label {
font-size: 1em;
color: #222;
}
.item-list .title {
font-size: 1em;
color: #222;
}
.links {
margin-bottom: 0;
}

.comment .links {
margin-bottom: 0;
}

/*
** Page layout blocks / IDs
*/

#content {
width: 1000px;
margin: auto;
position: center;
}

#content h2 a {
color: #ffffff;
}

#page {
background:#FFFFFF url('pagbg2.png') no-repeat scroll center top;
margin: auto;
}

#header {
background: #FFFFFF url('header17oct2.png') no-repeat scroll center top;
width: 1000px;
height: 115px;
margin: auto;
}
#logo {
vertical-align: middle;
border: 0;
}
#logo img {
float: center;
padding: 0 1em;
border: 0;
}
#menu {
padding: 0em 0em 0 0em;
text-align: right;
vertical-align: middle;
}
#navlist {
font-size: 1.0em;
padding: 0 0.8em 1.2em 0;
color: #9cf;
}
#navlist a {
font-weight: bold;
color: #fff;
}
#subnavlist {
padding: 0.5em 1.2em 0.4em 0;
font-size: 0.8em;
color: #9cf;
}
#subnavlist a {
font-weight: bold;
color: #9cf;
}
ul.links li {
border-left: 1px solid #9cf;
}
ul.links li.first {
border: none;
}
#search .form-text, #search .form-submit {
border: 1px solid #369;
font-size: 1.1em;
height: 1.5em;
vertical-align: middle;
}
#search .form-text {
width: 8em;
padding: 0 0.5em;
}
#mission {
background-color: #369;
padding: 1.5em 2em;
color: #fff;
}
#mission a, #mission a:visited {
color: #9cf;
font-weight: bold;
}
.site-name {
margin: 0.6em 0 0 0;
padding: 0;
font-size: 2em;
}
.site-name a:link, .site-name a:visited {
color: #fff;
}
.site-name a:hover {
color: #369;
text-decoration: none;
}
.site-slogan {
font-size: 1em;
color: #eee;
display: block;
margin: 0;
font-style: italic;
font-weight: bold;
}
#main {
/* padding in px not ex because IE messes up 100% width tables otherwise */
padding: 5px;
vertical-align: top;
}
#mission, .node .content, .comment .content {
line-height: 1.4em;
}
#help {
font-size: 0.9em;
margin-bottom: 1em;
}

.messages {
background-color: #eee;
border: 1px solid #ccc;
padding: 0.3em;
margin-bottom: 1em;
}
.error {
border-color: red;
}
#sidebar-left, #sidebar-right {
background-color: #ffffff;
width: 150px;
/* padding in px not ex because IE messes up 100% width tables otherwise */
vertical-align: top;
}

#content {
width: 1000px;
margin: auto;
position: center;
}

#footer {
background-color: #eee;
padding: 1em;
font-size: 0.8em;
width: 100%;
}

/*
** Common declarations for child classes of node, comment, block, box, etc.
** If you want any of them styled differently for a specific parent, add
** additional rules /with only the differing properties!/ to .parent .class.
** See .comment .title for an example.
*/

.breadcrumb {
display: none;
}

}
.links {
color: #999;
}
.links a {
font-weight: bold;
}

.submitted {
color: #fff;
font-size: 0em;
margin: 0px;
}

.block, .box {
padding: 0 0 1.5em 0;
}
.block {
border-bottom: 1px solid #bbb;
background-image: url('blockbg3.png');
padding-bottom: 0.75em;
margin-bottom: 0.2em;
}
.block .title {
margin-bottom: 0.5em;
margin-top: 0.5em;
}
.box .title {
font-size: 1.1em;
}
.node {
border-left: 1px solid #ddd;
border-right: 1px solid #ddd;
border-bottom: 1px solid #ddd;
background-color: #ffffff;
}
.sticky {
background-color: #FBFBFB;
border-left: 1px solid #ddd;
border-right: 1px solid #ddd;
border-bottom: 1px solid #ddd;
}

.node .content, .comment .content {
margin: .5em 0 .5em 0;
}

.node .taxonomy {
color: #999;
font-size: 0.8em;
padding-left: 1.5em;
}
.node .picture {
border: 1px solid #ddd;
float: right;
margin: 0.5em;
}
.comment {
border: 1px solid #abc;
padding: .5em;
margin-bottom: 1em;
}

.comment .title a {
font-size: 1.1em;
font-weight: normal;
}
.comment .new {
text-align: right;
font-weight: bold;
font-size: 0.8em;
float: right;
color: red;
}
.comment .picture {
border: 1px solid #abc;
float: right;
margin: 0.5em;
}

/*
** Module specific styles
*/
#aggregator .feed-source {
background-color: #eee;
border: 1px solid #ccc;
padding: 1em;
margin: 1em 0;
}
#aggregator .news-item .categories, #aggregator .source, #aggregator .age {
color: #999;
font-style: italic;
font-size: 0.9em;
}
#aggregator .title {
margin-bottom: 0.5em;
font-size: 1em;
}
#aggregator h3 {
margin-top: 1em;
}
#forum table {
width: 100%;
}
#forum td {
padding: 0.5em;
}
#forum td.forum, #forum td.posts {
background-color: #eee;
}
#forum td.topics, #forum td.last-reply {
background-color: #ddd;
}
#forum td.container {
background-color: #ccc;
}
#forum td.container a {
color: #555;
}
#forum td.statistics, #forum td.settings, #forum td.pager {
height: 1.5em;
border: 1px solid #bbb;
}
#forum td .name {
color: #96c;
}
#forum td .links {
padding-top: 0.7em;
font-size: 0.9em;
}
#profile .profile {
clear: both;
border: 1px solid #abc;
padding: .5em;
margin: 1em 0em;
}
#profile .profile .name {
padding-bottom: 0.5em;
}
.block-forum h3 {
margin-bottom: .5em;
}
div.admin-panel .description {
color: #999;
}
div.admin-panel .body {
background: #f4f4f4;
}
div.admin-panel h3 {
background-color: #69c;
color: #fff;
padding: 5px 8px 5px;
margin: 0;
}