Hi,
Yes you can do this easily. Just use "Your Window Name" in your target property instead of "_blank"
See the example below, it will always open the link is same new window.
<a href="http://www.google.com" target="mywindow">Open Google</a>
<a href="http://www.yahoo.com" target="mywindow">Open Yahoo</a>
Hopefully this will help you.
Regards