CSS fixes for IE

Hi - I'm hoping someone can give me some tips re: styling for Internet Explorer

I've made a site for a charity www.thedarkesthorse.co.uk (I used Firefox all the way through dev) but discovered that Internet Explorer is as usual very buggy.

Anyone got any tips on what I need to do to fix the alignment in the header and footer?

My fix-ie.css code

/**
 * Themetastic, for Drupal 5.0
 * Stefan Nagtegaal, iStyledThis [dot] nl
 * Steven Wittens, acko [dot] net
 *
 */

body {
  /* Center layout */
  text-align: center;
  /* Allow text resizing */
  font-size: 80%;
}

#header-region, #wrapper #container {
  /* Reset text alignment */

width: 800px;
margin: 0 auto;
text-align: left
 
}

#wrapper #container #center {
  /* Reduce amount of damage done by extremely wide content */
  overflow: hidden;
}

#wrapper #container #center .right-corner .left-corner {
  /* Because of the lack of min-height, we use height as an alternative */
  height: 400px;
}

fieldset {
  /* Don't draw backgrounds on fieldsets in IE, as they look really bad. */
  background: none;
}

ul.primary {
  /* Fix missing top margin */
  position: relative;
/*  top: 0.5em; */
}

/* Prevent fieldsets from shifting when changing collapsed state. */
html.js fieldset.collapsible {
  position: relative;
  top: -1em;
}
html.js fieldset.collapsed {
  top: 0;
  margin-bottom: 1em;
}

td.menu-disabled {
  /* Use filter to emulate CSS3 opacity */
  filter: alpha(opacity=50);
}

#header-region {
  /* Because of the lack of min-height, we use height as an alternative */
  height: 1em;
}

#attach-hide label, #uploadprogress div.message {
  /* Fading elements in IE causes the text to bleed unless they have a background. */
  background-color: #ffffff;
}

I'm also using the

  <!--[if IE 7]>
    <style type="text/css" media="all">@import "<?php print base_path() . path_to_theme() ?>/fix-ie.css";</style>
    <![endif]--> 

call in page.tpl.php

Any help would be greatly appreciated!!!!! :)

Thanks!