Paste this code into your shops Custom header mark up area.
<style type="text/css">
<!--
.footer_content{
position:fixed; bottom:0px; width:942px;height:50px;margin-left:10px;background-image:url('http://mydomain.com/shopfiles/footer_bar.jpg');
}
-->
</style>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
Paste this code into your shops Custom footer mark up area.
<script>
$("#scs_footer_inner_wrapper").addClass("footer_content");
</script>
