Hey!
I did not actually get a popup on that page, however it should not be hard to do. Just look around the javascript button code that you are given and you should find the code to open a window. Once you have that it is just a matter of putting it in an onload section of your body or javascript code.
I am not actually sure about on the blackberry as I have never used one (iPhone ftw), however if it can handle tabs/windows, there is a good chance that you can. However it may not work very well, as the current code doesn't even work properly on a mac

Spenser