Image in correct place in IE7, not IE 6??

I’m a newb.. ??
I updatd my blog: https://www.cogswappr.com last night with a new logo.
I’t displays correctly in IE 7, but IE 6.

I used a spanner(in bold) in header.php to have the log cover the blog name:
<div class=”headline”>
<h1>” title=”<?php _e(‘Home’); ?>”><span></span><?php bloginfo(‘name’); ?></h1>
</div>
<?php include(TEMPLATEPATH.”/ad_top.php”);?>
<div class=”TopMenu”>

• ” title=”<?php _e(‘Home’); ?>” id=”home”>Home

<?php wp_list_pages(‘depth=1&sort_column=menu_order&title_li=’ . __(”) . ” ); ?>

<div class=”rss”>“><img src=”<?php bloginfo(‘template_url’); ?>/images/rss.jpg” alt=””></img></div>
</div>

Here’s the code that I used in my stylehsheet.css:
#header span {
background: url(images/header_logo.jpg) no-repeat;
position: absolute;
bottom: -25px;
width: 100%;
height: 100%;
}