I'm presuming you're talking about opening the new web site in a new window, you can do this by using the following code in the 'a href' tag:
For example:
Code:
<a href="http://www.google.com" target="_blank">Google</a>
That would would open the web site Google in a new window, therefore the user will still remain on the previous website in a separate window.
I hope that is what you're in need of, if not, then try to explain what you're looking for in more detail.