residentevilplanet - Try this, it should work for you. You had the urls for the crowns all messed up in the code.
<script>
function name_across_board(){
//Created by Agent Moose (smcodes.smfforfree3.com)
var vfour = new Array()
vfour[vfour.length] = ["du","Du","Yellow","<img src='http://i137.photobucket.com/albums/q232/LaundryLady1947/Runescape/admin.gif' />"];
vfour[vfour.length] = ["Bicudo","Viktor","Red","<img src='http://i36.tinypic.com/nmck95.gif' />"];
for(f=0;f<vfour.length;f++){
$("a[href*='u=']").each(function() {
if(this.innerHTML.match(vfour[f][0])){
this.innerHTML = this.innerHTML.replace(vfour[f][0],"<font color='" + vfour[f][2] + "'>" + vfour[f][3] + vfour[f][(vfour[f][1] != "" ? 1 : 0)] + "</font>");
};});};}
name_across_board();
</script>