Add Google plus one Button in product details page

Past the following code in your magento product details page and you will see your Google plus one Button in your product page.
<div id="google-plusone" style="float: left;position: relative;top: 23px;left: -9px;">
<script type="text/javascript" src="https://apis.google.com/js/plusone.js">
{"parsetags": "explicit"},
{"lang": "<?php echo $this->__('en-GB') ?>"}
</script>
    <g:plusone size="medium" count="true" href="<?php echo trim(Mage::registry('current_product')->getProductUrl()) ?>"></g:plusone>
</div>
<script type="text/javascript">
gapi.plusone.go("google-plusone");
</script>