ok heres the code i used for my footer
<script type='text/javascript'>
/*
Change Any Image On Page
Created by iFusion
*/
var img_b = new Array();
img_b[img_b.length++] = [ "http://images.smfboards.com/ranks/3cyan.gif
, "http://s441.photobucket.com/albums/qq132/jeremy_m_bell/th_a.gif" ]
var all_images = document.getElementsByTagName('IMG');
for(i=0;i<all_images.length;i++){
for(j=0;j<img_b.length;j++){
if(all_images[i].src == img_b[j][0]){
all_images[i].src = img_b[j][1];
}}}
</script>[code]
[/code]