Code:

 

<script type='text/javascript by='swordbeta'>
//Money Hack
//By swordbeta of http://www.phantom-designs.net

var per = 5 //How much money each post
var start = 100 //With how much money you start?
var name = "Rupees" //Money name

//No edit needed after this line
if(location.href.match(/showtopic=/i)){
span = document.getElementsByTagName("span");
for(x=0;x<span.length;x++){
if(span[x].className=="postdetails" && span[x].innerHTML.match(/Posts: (\d+)/)){
var postcount = RegExp.$1
var count = per * postcount + start
span[x].innerHTML += "<br>"+name+": "+count
}}}
</script>