Adding Google+ on Corporate 2 (1.5 template)

Hi,
I would like to add Google+ button on Corporate 2 Joomla 1.5 template same as it appear/enable on Corporate 2 (version 2.5 template) which I can enable for bottom for all pages. How can I achieve this?

All that you need is to open file template/html/com_content/article/default.php and there paste code generate from Google+ developers site or use some external plugin which can add button directly to article.