If you add a link to a post in Blogger, it will show the underlying page in the same window as your Blog. If you want your visitors to stay on your Blog while looking at the pages you suggest to them, add an extra tag to the HTML-code with which the link is made. It is called a TARGET, which you set to BLANK.
- this link opens in the same window
- this link opens in a new window
The code looks like this: