Cara buat Format Rp Input Text

Bismillah, kali ini saya akan share bagaimana caranya membuat format Rp di tag div.
berikut ini syntaxnya.
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<script>

function formatCurrency(num) {
num = num.toString().replace(/\$|\,/g,'');
if(isNaN(num))
num = "0";
sign = (num == (num = Math.abs(num)));
num = Math.floor(num*100+0.50000000001);
cents = num%100;
num = Math.floor(num/100).toString();
if(cents<10)
cents = "0" + cents;
for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)
num = num.substring(0,num.length-(4*i+3))+'.'+
num.substring(num.length-(4*i+3));
return (((sign)?'':'-') + 'Rp' + num + ',' + cents);
}
</script>
</head>

<body>
Harga: <input type="text" name="num" id="num" onkeyup="document.getElementById('format').innerHTML = formatCurrency(this.value);"/><span id="format"></span>
</body>
</html>

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Semoga bermanfaat.

http://pangeran-it.blogspot.com/