Somewhat you would still have to use an image swap code added to your footer example
<script type='text/javascript'>
function swap_img(){
var img_b = new Array();
img_b[img_b.length++] = [ "https://cdn.smfboards.com/ranks/dl_ranks2/rank_0.gif" , "https://yourrankfilefile.com/image.gif" ]
var a_i = document.getElementsByTagName('IMG');
for(i=a_i.length-1;i>=0;i--) for(j=0;j<img_b.length;j++) if(a_i[i].src == img_b[j][0]) a_i[i].src = img_b[j][1];
}
swap_img();
</script>