since the background size is special CSS3, you will need to use something like this to make it work in IE
install html and body
html {overflow-y:hidden}
body {overflow-y:auto}
wrap the image you want fullscreen with div # page-background
#page-background {position:absolute; z-index:-1}
then put this in your html file
<div id="page-background">
<img src="/path/to/your/image" width="100%" height="100%">
</div>
** you will have to use some kind of reset to remove the fields and pads, something like this
html, body {height:100%; margin:0; padding:0;}
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