The main thing is to use the target option in a href
a href="http://kickme.to/zzbio" target="_self" will make the link come up in the current window.
a href="http://kickme.to/zzbio" target="_blank" will make the link come up in its own brand new window.
In order to get the window to come up in a set size though as in the maps database here at DFHQ you will have to add some javascript to your page.
Iyou dont know how to set up your own javascript there are plenty of places on the web that have the relevant code available to you.
I just found this utility while I was researching this answer. I don't know how well it works but this utility generates the code you need to make javascript pre-sized pop up windows.
http://www.codelifter.com/pop5index.html
Let me know how well it works for you.