* html div#header h1 a
{
 background      : none;
 filter          : progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/site-media/img/layout/logo.png', sizingMethod='scale');
}

*html div#header a#microsite_link
{
 background      : none;
 filter          : progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/site-media/img/layout/microsite_link.png', sizingMethod='scale');
}