Now adding Rupee Sign to your Magento Store is very easy, just follow these steps and you will be done.
1. Download this JS file from here and upload to root/js folder.
2. Open file here app/design/frontend/default/YOUR THEME/layout/page.xml and add a new line
<action method=”addJs”><script>rupee.js</script></action> after <block type=”page/html_head” name=”head” as=”head”>.
3. Open a file lib/Zend/Locale/Data/root.xml and find code <symbol>Rs</symbol> and replace it with <symbol>Rs. </symbol>
That`s It.
Note: Dont forget to clear cache.
Now you can see a nice Rupee Sign in frontend.